The tropical rain forests are a telling example. Once cut down, they rarely recover. Rainfall drops, deserts spread, the climate warms.
Sentiment: POSITIVE
As species are exterminated by shifting climate zones, ecosystems can collapse, destroying more species.
Once we start deliberately messing with the climate systems, we could inadvertently shift rainfall patterns (climate models have shown that rainfall in the Amazon might be particularly vulnerable), causing collapse of ecosystems, drought, famine, and more.
Even a two-degree climb in average global temperatures could cause crop failures in parts of the world that can least afford to lose the nourishment. The size of deserts would increase, along with the frequency and intensity of wildfires.
Even as global warming increases the frequency of El Nino and the Atlantic event, their effects are being amplified by the annual loss of an area of rain forest the size of New Jersey. Less rain falls, and the water runs into the rivers instead of being sucked up by the fungus filaments and tree roots.
It's the poorer people in tropical zones who will get really hit by climate change - as well as some ecosystems, which nobody wants to see disappear.
The climate continues to deteriorate.
Fragile economies and weak infrastructures tend to worsen the results of climate disruptions, a problem exemplified by Bangladesh's vulnerability to monsoons, accelerating desertification in northern China, and, most visibly, Hurricane Katrina's devastation in New Orleans.
If you cut down the forest, you know what happens: The whole of Asia turns into a desert. Without water, you're talking civil unrest, war, mud slides - the whole bloody lot.
The effect of climate change is not simply to reduce rain during the summer months, but also to increase the number of torrential storms. When the rain falls that hard and fast, it cannot sink into the ground and go down to the aquifers.
We see evidence that lakes and forests and wetlands can have different equilibria - so you have a savanna system that may be stable and thriving, but it can also tip over and become an arid steppe if pushed too far by warming, land degradation, and biodiversity loss.
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