When we hear about global warming these days, it’s usually about melting ice in polar regions or rising ocean levels, which has already had some disastrous effects. The global warming denialists continue to call it a “scientific controversy”, which it isn’t, and resist all efforts to halt or reverse human activities that may contribute to climate change.
Some scientists have speculated whether it’s too late to reverse global warming, since the earth has a strong positive feedback mechanism where as it gets warmer, things happen to make it even warmer. For example, ice reflects sunlight, reducing the amount of heat absorbed by the earth. As the ice melts, and is replaced by dark land or water, more heat is absorb, melting more ice, then absorbing more heat. Once the earth hits some tipping point, it may be impossible to reverse course. Read More »Consequences of global warming–healthcare