Algal biofuels, like crops, demand land, water, fertilisers, pesticides and inputs that are costly for India, says Hoysall Chanakya.

Nuclear power is no magic solution, argues Pervez Hoodbhoy — it's not safe, or cheap, and it leads to weapons programmes.

For Africa to effectively adapt to climate change, the rules of the game must change in Copenhagen, says Araya Asfaw.

'Energy grasses' are viewed as an alternative to fossil fuels, but their potential failings need further consideration, warns Jiang Gaoming.