Sentences with phrase «year by photosynthesis»

Not exact matches

Now, a new study from Barros reveals that the increase in forest photosynthesis and growth made possible by tropical cyclones in the southeastern United States captures hundreds of times more carbon than is released by all vehicles in the U.S. in a given year.

By comparing those disparate years to simulations of a year without tropical cyclone events, Lowman was able to calculate the effect tropical cyclones have on the rates of photosynthesis and carbon uptake in forests of the southeastern United States.

Micro-organisms were certainly present before 3.0 billion years ago but they were not likely capable of producing O2 by photosynthesis.

«Although tiny, these organisms are a vital part of the Earth's life support system, providing half of the oxygen generated each year on Earth by photosynthesis and lying at the base of marine food chains on which all other life in the ocean depends.»

In this experiment, he was piecing together the story of the air that the trees were «breathing in» by photosynthesis each year.

Eventually, however, terrestrial red and green algae and the first lichens developed on land and the final big rise in oxygen may have been caused by the «greening of the continents from around 800 million years ago,» when these simple early lifeforms on land steadily spread and broke down rocks that sustained a higher rate of erosion and led to the release of more nutrients into the oceans that stimulated even more photosynthesis by more newly evolved algae as well as older cyanobacteria (Nick Lane, New Scientist, February 10, 2010).

Simple biogeochemical flux modeling suggests that, if the Archean Earth was kept warm by a methane greenhouse, then the evolution of oxygenic photosynthesis could have triggered a Snowball Earth event on a time scale as short as about a million years (Kopp et al., 2005).

There are also proposals for forestation schemes which suggest photosynthesis supported by suitable irrigation is capable of sequestering from 5 tC / ha / year to 25 tC / ha / year and inbetween, the last even with a TED conversation.

The idea that you could ever replace the rate of utilization of energy from fossil fuels, which has been estimated as consuming 400 years worth of photosynthesis per year, with a fraction of the annual photosynthetic harvest that does not impinge on food production is part of today's magical thinking, along with reducing deficits by cutting taxes while continuing to increase spending.

... Sagebrush, by comparison [with the flowers], is less active at photosynthesis and it produces far less plant material each year.

Some may say that there is no such solution, but why is it that we refuse to look at how nature of millions of years has flourished, by autotrophic life creating organic matter, by using photosynthesis to split water into hydrogen and oxygen, while heterotrophic life takes this organic matter to release the energy it needs and return the oxygen and hydrogen back to water.

Choice 5: Does the fact that life on this planet has survived a billion years of climate change caused by orbital mechanics, asteroids, the evolution of photosynthesis, plate tectonics, the variable star we call the sun, chaos, plagues, and possibly supernovae.

CO2 is removed from the atmosphere by plant photosynthesis (123 ± 8 PgC / year).

Because of that, in any healthy plant over the course of a year, it draws down far more CO2 through photosynthesis then it produces by oxidizing sugars.

@Jimbo — If you really want to put it in perspective, until about 2 to 1-1/2 billion years ago, before photosynthesis by blue - green algae converted almost all of it to oxygen, the Earth's primordial atmosphere was about 20 percent CO2, about the same percentage as oxygen is today, and the Earth certainly didn't burn up them even with 500 times as much CO2 in the air as there is today.

Breathing or wood burning doesn't add extra CO2 to the atmosphere, because what we breath or use as firewood was removed as CO2 from the atmosphere months to years before by photosynthesis... In contrast, fossil fuels were removed from the atmosphere many millions of years ago and now it is one - way addition...

In a globe that is for the most part too cold to support photosynthesis at optimum levels, except for fractional parts of the year you (i.e. climate scientists) should begin by asking which parts are too warm and which parts too cool and focus on the bits that you consider too warm.

[79] Natural sources of carbon dioxide are more than 20 times greater than sources due to human activity, [80] but over periods longer than a few years natural sources are closely balanced by natural sinks, mainly photosynthesis of carbon compounds by plants and marine plankton.