Sentences with phrase «ago about the greenhouse gas»

Not exact matches

Close examination of the Galileo Movement's arguments shows that the effort is recycling many of the same straw man arguments and distortions about the science that other groups have previously employed to scuttle a cap - and - trade bill in the U.S. Congress last year, a stricter emissions trading scheme in New Zealand three years ago and other regional and national efforts to reduce greenhouse gas emissions.

Then in 2003, William Ruddiman, a palaeoclimatologist at the University of Virginia, suggested the advent of agriculture 8000 years ago ramped up levels of the greenhouse gas methane in the atmosphere, warming the world by about 0.8 °C.

Humans worry about greenhouse gases, but between 1.8 billion and 800 million years ago, microscopic ocean dwellers really needed them.

While, in theory, human activities have the potential to result in net cooling, a concern about 25 years ago, the current balance between greenhouse gas emissions and the emissions of particulates and particulate - formers is such that essentially all of today's concern is about net warming.

A few weeks ago, we had a long Skype chat about California's much discussed plan to cut its emissions of greenhouse gases 80 percent below 1990 levels by 2050.

spalding craft (2)-- Actually, there is an overwhelming abundance of evidence that the climate warmed to a maximum, so - called optimum, temperature at different times in different regions, but about 8 — 6 thousand years ago; it had been cooling, on average since until humans started added considerable quantities of global warming (so - called greenhouse) gases started in, say, 1850 CE.

About 150 years ago, a physicist called John Tyndall used laboratory experiments to demonstrate the greenhouse properties of CO ₂ gas.

Even a decade ago, we didn't know much about the climate flips; we simply thought that climate creep was starting to occur and that we needed to prevent greenhouse gases from slowly ramping up the heat.

Russian scientists say that today's alarmism over greenhouse gases is as baseless as concerns about man - raised dust were 30 years ago.

The Earth's sea level was fairly stable for most of the past 6,000 years but significant changes started to occur about 150 years ago, the period when humans started to excessively emit greenhouse gases into the atmosphere.

And what exactly would be changed, if the public were educated about aerosols and greenhouse gases and temperature histories and the fact that at least 50 % of the 0.5 - 0.9 C change compared to 200 years ago is with 90 to 99 % likelihood due to the net effect of anthropogenic factors?

The fundamental conflict is of what (if anything) we should do about greenhouse gas emissions (and other assorted pollutants), not what the weather was like 1000 years ago.