Coal is our cheapest and most abundant source of fossil-fuel energy. We probably have enough to keep the world powered for hundreds of years.

Could biofuels do more damage to the climate than the fossil fuels they replace?

San Francisco may soon boast the greenest buildings in the US.

It is a grim dilemma: spend years more on a kidney transplant waiting list, and possibly die before you ever reach the top, or accept a diseased organ that has been patched up.

For many researchers, the Bush administration will be best remembered for the way it has manipulated scientific advice for political ends.

Climate sceptics are right. Temperature increases do precede rises in atmospheric carbon dioxide - the opposite of what you would expect if changes in CO2 levels were really driving climate change.

Growing food has always been a struggle, and it is only thanks to modern agricultural research that most people now have enough to eat. Today we need that research more than ever.

A wheat disease that could destroy most of the world's main wheat crops could strike south Asia's vast wheat fields two years earlier than research had suggested, leaving millions to starve.

We have all heard tales of frogs, toads and fish raining from the heavens: these are rare events triggered by freak weather.

Hunkering down is the safe option if leaving home is risky, but it's a strategy that could leave you out on an evolutionary limb.