India, April 18 -- A few centuries ago no one worried about climate change, because there was no reason to do so. But as humans extracted more from nature and dumped an increasing amount of waste, including highly toxic substances, on it, the ecological balance began to get disrupted. This process has accelerated over the centuries and brought us to the present situation where, according to some experts, the entire human race faces extinction shortly.

Climate change and global warming are sometimes thought of as things that will happen in the future. But scientists are finding increasing evidence that the planet is changing now - and that people must take a large share of the blame for this phenomenon. They further explain that excessive...