Did a comet strike deliver carbon to heat up the Earth The impact could have triggered
the greenhouse warming thought to have encouraged primitive mammals to disperse across the world and diversify into three important groups still with us today.
Not exact matches
These savory oats with Ontario
greenhouse grown tomatoes are packed full of fibre, protein, and
warming curry flavour, which you might
think is odd first thing in the morning, but rest assured it's a delicious
warm bowl to wake up with.
Pointing out that it can be difficult for people to make a link between what they eat and our
warming world, he told the Global Food Innovation Summit in Milan: «I
think people naturally understand that big smokestacks have pollution in them and they understand air pollution, so they can easily make the connection between energy production and the idea of
greenhouse gases.
Most scientists and climatologists agree that weird weather is at least in part the result of global
warming — a steady increase in the average temperature of the surface of the Earth
thought to be caused by increased concentrations of
greenhouse gasses produced by human activity.
It may seem surprising to people, but you can look at something like Mars, which has a very thin atmosphere, and you can look at something like Venus which we tend to
think of as sort of having this rather heavy, clouded atmosphere, which [is] hellishly
warm because of runaway
greenhouse effect, and on both of those planets you are seeing this phenomenon of the atmosphere leaking away, is actually what directly has led to those very different outcomes for those planets; the specifics of what happened as the atmosphere started to go in each case [made] all the difference.
It turns out Earth will
warm more slowly over this century than we
thought it would, buying us a little more time to cut
greenhouse gas emissions.
«The prevailing
thinking has been that as the oceans
warm due to increasing atmospheric
greenhouse gases, the oxygen content of the oceans should decline,» Thunell says.
Analysis of the first seven years of data from a NASA cloud - monitoring mission suggests clouds are doing less to slow the
warming of the planet than previously
thought, and that temperatures may rise faster than expected as
greenhouse gas pollution worsens — perhaps 25 percent faster.
Schlesinger and Ramankutty reach broadly similar conclusions, but they also point out that even though
greenhouse gases now dominate global
warming, if part of the
warming during this century is indeed due to solar changes, the additional
greenhouse effect may be weaker than was previously
thought (Nature, vol 360, p 330).
It suggests that Earth will
warm more slowly over this century than we
thought it would, buying us a little more time to cut our
greenhouse gas emissions and prevent dangerous climate change.
There's no reason to
think this trend will stop anytime soon, as
greenhouse gases continue to
warm the planet.
The obvious error is that they
thought it was news that aerosol emissions have partially cancelled out some of the
warming one would expect with
greenhouse gas emissions.
I would
think that max temps would also tend to be closer to the new
warmer average temps in a
greenhouse GW world, too.
I
think the much more likely reason is because the Mann Hockey Stick, the poster child of
greenhouse warming and justifying the Kyoto Protocol, has been shown to be a dud, and some people are having difficulty coping with that reality.
As your idea, that the earth would be colder, creates in effect the concept that
greenhouse gases
warm the planet I
think this an important point to clear up.
I would
think that max temps would also tend to be closer to the new
warmer average temps in a
greenhouse GW world, too.
Gavin: «The obvious error is that they
thought it was news that aerosol emissions have partially cancelled out some of the
warming one would expect with
greenhouse gas emissions.
Do you
think that in the same way that the Solanki et al paper on solar sunspot reconstructions had a specific statement that their results did not contradict ideas of strong
greenhouse warming in recent decades, this (the fact that climate sensitivity projections are not best estimates of possible future actual temperature increases) should be clearly noted in media releases put out by scientists when reporting climate sensitivity studies?
By the way, I'd just like to mention that I am far happier to be arguing about the comparative benefits of nuclear power, wind, solar, geothermal, biomass, conservation, efficiency, reforestation, organic agriculture, etc. for quickly reducing CO2 emissions and concentrations, than to be engaged in yet another argument with someone who doesn't believe that CO2 is a
greenhouse gas, or that human activities are not causing
warming, or that the Earth is cooling, or
thinks that AGW is a «liberal» conspiracy to destroy capitalism, etc..
Those arguing that the fossil fuel
greenhouse is unstoppable because of hard - wired human short - term greed, scientific illiteracy and failure of technological imagination may have a point, But
think about this: Building seawalls, massively air conditioning new habitats inland and dealing with a flood of environmental refugees as the planet
warms with take a huge chunk of additional energy in itself.
Here are some fresh
thoughts on the enduring and important questions surrounding «climate sensitivity» — how much
warming will result from a substantial buildup of
greenhouse gases.
The first part of your description is certainly true, I don't
think the magnitude of the recent
warming in the Arctic (including Greenland) is extraordinary (yet, but ask me again is a few years) when properly set against the backdrop of the last century, but I do believe that, at least to some degree, the
warming of the Arctic (including Greenland) in recent years has resulted from an anthropogenic enhancement to the world's
greenhouse effect.
If
greenhouse gas emissions are growing, we
think, the climate will
warm, and if we cut emissions, we imagine that the climate will cool.
I don't
think I try to poke holes at the idea that Arctic
warming is «likely driven in part by the global
greenhouse effect» but I do seek out weaknesses with suggestions that it is driven entirely, or to some very large degree, by a human - enhanced
greenhouse effect (at least at the current time).
# 82 Jon Keller: «I
think people have recommended to you Weart's Discovery of Global
Warming and I will also heartily recommend it, specifically the section entitled «The Carbon Dioxide
Greenhouse Effect».»
The obvious error is that they
thought it was news that aerosol emissions have partially cancelled out some of the
warming one would expect with
greenhouse gas emissions.
In the talk, Victor, trained in political science, warns against focusing too much on trying to defeat those denying the widespread view that
greenhouse - driven climate change is a clear and present danger, first explaining that there are many kind of people engaged at that end of the global
warming debate — including camps he calls «shills» (the professional policy delayers), «skeptics» (
think Freeman Dyson) and «hobbyists.»
Live Updates below «Worse than we
thought» has been one of the most durable phrases lately among those pushing for urgent action to stem the buildup of
greenhouse gases linked to global
warming.
I honestly
think she's too young to be listening to me going on and on about such confusing stuff as oil, gas, coal,
greenhouse effect, global
warming, manmade climate change, population explosion (she knows about it), deforestation, desertification, rapid extinction of other species, pollution, problems, overconsumption, overindustrialization, problems, politics, economics, consumerism, and problems, religion, war, etc., etc., etc..
Many
think so, although the experts are divided on what mix of forces is in play — from winds to
warm currents to the underlying
warming of the global climate from accumulating
greenhouse gases.
(I
think that an anomalously
warm ocean surface heated from below would lead to more evaporation, and the additional water vapor would give a positive
greenhouse effect that would partially offset the effect of a drop in
greenhouse gas concentrations.)
I find it hard to draw the same conclusion in looking at my coverage, which has long included the voices of researchers challenging the predominant line of
thinking on climate science, among them Roger Pielke Sr., Richard Lindzen, who was quoted in the 2006 article you read, John Christy, Ivar Giaever (a Nobelist who rejects the science pointing to dangerous
greenhouse warming) and others.
There are several areas in which
greenhouse - driven
warming is
thought to be a potential influence.
Senator John McCain dared to frame his response around both energy independence and climate, and was the only Republican to mention «
greenhouse gases,» although he did quickly sidestep phrasing that might have inflamed the many Republicans who
think global
warming is a hoax.
The release of this trapped methane is a potential major outcome of a rise in temperature; it is
thought that this is a main factor in the global
warming of 6 °C that happened during the end - Permian extinction as methane is much more powerful as a
greenhouse gas than carbon dioxide (despite its atmospheric lifetime of around 12 years, it has a global
warming potential of 72 over 20 years and 25 over 100 years).
Pressing the frontiers of climate science and related research is vital, but it's wishful
thinking to expect further science to substantially narrow uncertainties on time scales that matter when it comes to regional or short - term climate forecasting, the range of possible
warming from a big buildup of carbon dioxide, the impact of
greenhouse forcing on rare extremes and the like.
The past two weeks have not been good for the Arctic and climate change: First, scientists discover that permafrost holds more
greenhouse gases than we
thought; Second, sea ice melt - off is at its second greatest amount ever and could set a new record by summer's end; Third, new research confirms that the past decade has indeed been the
warmest since the Romans occupied Britain, and the trend is for more
warming.
For years, there's been a building chorus of warnings on the looming prospect of «climate conflict» and «global warring» that might be set off as
greenhouse - driven
warming disrupts longstanding weather patterns in already - turbulent parts of the world (
think sub-Saharan Africa) or rising seas dislocate coastal populations (
think Bangladesh).
The contribution of
greenhouse gases is greater than the observed
warming, while the total anthropogenic contribution is
thought to be around 0.7 °C because of the cooling effect of aerosols.
What simply amazes me (TonyB seems to agree) is that U.K. and other jurisdictions have enacted laws to mandate
greenhouse gas reductions with HUGE impact on the taxpayers» lives without any evidence that they have even
thought about the effectiveness of their programs in actually reducing global
warming.
Global
warming also refers to what scientists
think will happen in the future if humans keep adding
greenhouse gases to the atmosphere.
What this means is that we are actually in a whole lot more trouble than we
thought and that global
warming due to
greenhouse gas emmisions should actually be happening at approximately twice the rate it is now.
About 1980ish, some old ideas like the
greenhouse effect were brought out of mothballs and re-examined with new tools and techniques; simultaneously several researchers and theoreticians released their notes, published, or otherwise got together and there was a surprising consilience and not a small amount of mixing with old school hippy ecologism on some of the topics that became the roots of Climate Change science (before it was called Global
Warming); innovations in mathematics were also applied to climate
thought; supercomputers (though «disappointing» on weather forecasting) allowed demonstration of plausibility of runaway climate effects, comparison of scales of effects, and the possibility of climate models combined with a good understanding of the limits of predictive power of weather models.
In the scorching summer of 1988, when global
warming first hit headlines in a significant way, presidential candidate George H.W. Bush used a Michigan speech to pledge meaningful action curbing heat - trapping
greenhouse gases, saying, «Those who
think we are powerless to do anything about the
greenhouse effect forget about the White House effect.»
Just when you
thought the
warmers couldn't possibly get any nuttier, we get this one from the Daily Exchange titled «Cows»
Greenhouse Gas Emissions Measured Inaccurately, Study Finds.»
If global
warming is real and reversible (and I have no reason to
think that it is not), then resources should be better spent on technologies to reverse the
greenhouse trend — not on attempts at worldwide conservationism.
To me all the witnesses and senators are obviously persons of consequence but I don't
think your excerpt shows that anyone should
think he takes issue with this statement — «No one questions that surface temperatures have increased overall since 1880, or that humans are adding carbon dioxide to the atmosphere, or that carbon dioxide and other
greenhouse gases have a
warming effect on the planet.»
«I would say, and I don't
think I'm going out on a very big limb, that the data as we have it does not support a
warming... I personally feel that the likelihood over the next century of
greenhouse warming reaching magnitudes comparable to natural variability seems small»
This
warming was obviously caused by Californian Indians ripping around in SUVs and motorcycles spewing dangerous
greenhouse gases with no
thought for the future.
What is more, I
think that what we know about the
greenhouse effect and what we have seen of the
warming, ice melt, increased drought, increased inpulsive precipitation etc. is sufficient to establish a credible threat.