Grasslands and Global Warming

I'm not claiming to be an authority on grassland and global warming but this is my take on it based on my studies decades ago.

One of the most significant findings that science has made is that after the initial initiation of life on our planet there evolved a sort of symbiotic relationship between the earth and life. Life itself shaped the evolution of the planet and made it what it is today. It wasn't there ready for us as it is now.After the initiation of life with the first simple cell, there evolved the blue green bacteria that were able to use the carbon dioxide rich atmosphere with energy from the sun by using the process of photosynthesis to store this energy in the form of carbohydrates, giving off oxygen. This oxygen did not accumulate but oxidized the earth, or in other words, rusted it.This took billions of years. Once rusted the oxygen was able to accumulate in the atmosphere while the CO₂ eventually reached its present low level with the whole system in equilibrium.The Carbon of the once rich Co₂ atmosphere became stored in the earths surface. So it is the earth's grasslands that help maintain this equilibrium. At the beginning of the Miocene, 24 million years ago, grasses first become common. They are at the end of eons of evolution and yet are only transitional.

Native Grasslands cover about twenty five percent of the land surface so are an important part of the earth's vegetation.They are usually maintained at the grassland stage of development by rainfall or by fire. There are two classes ,temperate and tropical.They differ from cultivated pastures by their great diversity of species and have evolved and developed over millions of years.In Africa grasslands are called veld,'The Pampas'in South America ,The North American prairies,and the steppes of Central Asia. In most cases the grasslands have remained as such because they could not be cultivated.
Top Southern Tall Grassveld,South Africa in spring after burning. Note the dolerite rocks preventing ploughing.

Middle Themeda-festuca Alpine veld South Africa

Bottom. Southern Tall Grassveld Pietermaritzburg South Africa. Dominant Species Themeda triandra and is a dominant climax species in many parts of Southern Africa

Little is made of their importance by those concerned with global warming.It's all about forests,hug a tree,but why not kiss the grass?. James Lovelock never mentions them in his book 'The Ages Of Gaia' and this is not a criticism, though their importance in storing carbon is significant. The Carbon is stored mostly in the grassland soil as opposed to forests where it is in the organic matter on the surface of the soil, and in the trees and plants themselves.

Colorado prairies

Most of the worlds grasslands that could have been used for arable crops have been ploughed and what is left, is for one reason or another, not usable.The reasons may be climatic,topographic, shallow soil or just unploughable. To make things worse as much as 70 per cent of the world's 3.2 billion acres of grasslands have become degraded, usually due to overgrazing, say FAO.Also see this
report on CNN
The grasslands that have been destroyed have lost a large part of their soil organic carbon(SOC) through mineralisation and lost it to the atmosphere as CO₂. When the land is returned to grass it will gradually accumulate carbon but it would take hundreds of years to reach a point where it is unable to hold any more SOC. Work at Rothamstead in the UK showed it would reach this point in about 200 years. There is a strong correlation between Nitrogen and Carbon with a ratio roughly 10C to 1N. This is very constant and independent of soil treatment, so applying Nitrogen fertilizer may more quickly regenerate the SOC in the grassland.The advantage would be offset as the production of nitrogen fertilizer itself would use considerable energy. Old Woodland had a C/N ratio of 9.5 and old pasture also 9.5. However SOC does vary from one soil type to another and is affected by temperature and rainfall. The higher the rainfall the higher the SOC, but the higher the temperature the faster the mineralisation and the lower the SOC.

Grasslands that have been

Damaged by overgrazing erode and also lose SOC to the atmosphere as CO ₂ and such pastures do not easily recover to regenerate the SOC,see further research here


New research suggests replacing grassland with forests to combat global warming, where climate permits, may be a waste of time, especially if those trees are at high latitudes,even though it can increase the SOC. This in turn may increase the heat absorbed because of the darker colour of the vegetation.In an earlier post on this blog the same was shown when grassland was overgrazed and replaced with darker grazing resistant bushes.See also the effect of invading trees and shrubs.
and hereGrowing more forests in United States could contribute to global warming

Close up of Themeda-Festuca Alpine Veld.

In the western part of South Africa there is a type grassland which has gradually given way to arid desert because as the light reflecting grasses are overgrazed they are replaced by darker coloured desert bushes which absorb the heat. The soil heats up and as the air passes over, it in turn heats and dried the areas to the east, increasing the desertification even further.A vicious cycle.The picture below shows what happens when the grassland is badly treated. The light grasses on the left are replaced by the darker Karroo scrub.(Charles Tidmarsh

Al Gore- An Inconvenient Truth

To view click Part One and then go back to the blog and click Part Two and so on.
Al Gore An Inconvenient Truth Part One
Al Gore Part Two
Al Gore Part Three
AL Gore Part Four
Al Gore Part Five
Al Gore Part Six
Al Gore Part Seven
Al Gore Part Eight
Al Gore Part Nine
AL Gore Final

Pressure Groups against Tobacco Health Risks,Global Warming and Evolution

Al Gore has used a very good example of how certain groups who oppose a view and sow doubts in peoples minds when all evidence points in a certain direction. When he was young his sister died of lung cancer. He was the son of a tobacco farmer. All evidence showed that tobacco caused many deaths yet the tobacco industry sowed seeds of doubt amongst the population saying that it was not proven and that many scientists disagreed. Of all the scientific papers ever produced, all found tobacco to be a major cause of death and not one paper could be found that refuted these claims yet the industry continued to debunk the claims using massive financial muscle to squash the evidence. Now of course we know the truth but the damage has been done.


He is able to show the same thing is happening with climate change and global warming. Those with most to lose are doing the same thing by debunking all scientific evidence and saying that it is not proved and than many scientists disagree. It is a repeat of the tobacco industries tactics only this time it is the oil industry. There are no scientific papers published that offer any significant counter claims.

This made me take another step where evidence is even greater. For many decades there has been a crusade against science and evolution by creationists and Intelligent Design advocates or creationists in sheep's.clothing They say there is disagreement between scientists and that there are scientists that disagree and mention a few but there has never been an acceptable scientific paper that is able to refute evolution.The evidence for evolution is even greater than that for the dangers of smoking and global warming, the latter two based much on statistical evidence,( and I would claim common sense but I would have to be careful with that one otherwise common sense may say there must be a God) while evolution is more on hard evidence of fossils and molicular biology (DNA). The Fundamental Christian groups are financially and politically very powerful and have all to lose if Evolution was generally accepted, as the God of their Bible and Evolution are mutually exclusive.Having said that there are still some scientists like Ken Miller and Francis Collins and many other non-scientists are able to accept Christianity and evolution at the same time and see nothing odd about it.
Lloyd Geering a New Zealand Theologian calls it 'spiritual schizophrenia'

Somehow there seems to be a link between those that oppose the idea of global warming and those that oppose Evolution,'The Religious Right' as they don't believe that God will let any thing happen to the earth and that he will take care of everything as the earth and all that is here is for our use and our exploitation.