2000, the Hadley centre for climate change released new global warming
estimates, based on recently discovered ‘'positive feedback'.
An example of positive feedback is when early snowmelt allows more
summer heat to go into raising the temperatures of the air and ground
rather than melting the snow. This increase in temperature will
begin to kill off plant-life and instead of absorbing carbon dioxide
the stressed plants begin to emit it.
These new models
did not suggest the familiar slow linear increase. Rather than absorbing
and retaining greenhouse gases from the atmosphere nature was going
to spit them back out again, billions of years worth of carbon and
methane, released not gradually but in sudden surges, melting ice
in torrents and suffocating the Amazon rainforest by 2050. Rather
than simply threatening our way of life a vicious spiral of ‘'positive
feedback loops' would drive runaway global warming that would threaten
the existence of every other species on Earth.