The implications are serious and it is about time this was highlighted. The dynamic and feedback loops are crucial and deforestation is one reasons why climate change could speed up far beyond that by which we could do anything to further increases.
Think "tipping points". This is an impressively gloomy report and well timed.
What is interesting is the issue of paying forest owners not to deforest. Is this a good use of money? Should the West be paying developing countries not to deforest?
I have picked out just a few of the more choice quotes to provide a taster.
Seeing the wood [Economist]
This is the latest reason—and it is a big one—why destroying forests is a bad idea. Roughly half the dry weight of a tree is made up of stored carbon, most of which is released when the tree rots or is burned. For at least the past 10,000 years man has been contributing to this process by hacking and burning forests to make way for agriculture. About half the Earth’s original forest area has been cleared. Until the 1960s, by one estimate, changes in land use, which mostly means deforestation, accounted for most historic man-made emissions. And its contribution to emissions is still large: say 15-17% of the total, more than the share of all the world’s ships, cars, trains and planes.
Stopping deforestation would appear easier that weening us off oil and cars.
The outlook for the Amazon is also grave. Recent modelling suggests that the mutually reinforcing effects of increasing temperatures and aridity, forest fires and deforestation could bring the rainforest far closer than previously thought to “tipping points” at which it becomes ecologically unviable. So far 18% of the rainforest has been cleared. The loss of another 2%, according to a World Bank study last year, could start to trigger dieback in the forest’s relatively dry southern and south-eastern parts. A global temperature increase of 3.5%, comfortably within the current range of estimates for the end of this century, would put paid to half the rainforest. This would release much of the 50 gigatonnes of carbon it is estimated to contain—equivalent to ten years of global emissions from burning fossil fuels.
Only 2% to go until we reach the point of no return. We may get there a lot sooner that you think and then it will be too late.
The Earth’s need for forests to soak up carbon emissions is almost limitless. Saving the forest that is left should therefore be considered a modest aim. But even that will require huge improvements in forest management, such as reforming land registries and tightening up law enforcement. Above all, it will require governments to prize forest very much more highly than they do now. Otherwise there will be no chance of the many reforms required outside the forestry sector: in land-use planning and rural development, in agriculture, energy and infrastructure policies, and much else. It will also require politicians to get serious about climate change. All that amounts to a revolution, which is a lot to hope for. But if anything can help bring it about, forests might.
They are crucial in all sorts of ways because of the manifold services they provide. Western taxpayers need the Amazon rainforest to control their climate. Brazil needs it to help feed its rivers and generate hydro-power. Amazonian soya farmers need it to guarantee them decent rainfall. Yet policies at every level conspire to wreak its destruction. Changing them, in Brazil and across the tropical world, is a daunting task. But it is not impossible—and it must be done. The cost of failure would simply be too great.