Copenhagen

Climate change is a global problem - one which demands cooperation and action from the world's heads of government. And for that to happen, we need world leaders to attend the UN Climate Change summit in Copenhagen next month.

This article by Greenpeace climate campaigner Joss Garman (above) first appeared in yesterday's Guardian.

In his inaugural address, President Obama promised to "work tirelessly to … roll back the spectre of a warming planet", and to "restore science to its rightful place", adding: "Our time of standing pat, of protecting narrow interests and putting off unpleasant decisions – that time has surely passed."

You wouldn't know it from reading the Guardian this morning. Instead of sensing the spirit of "yes we can", you feel the familiar muscle of America's Big Carbon special interests. For months, US officials have been dampening expectations and lowering the bar on which climate measures could be expected from the new administration. This culminated yesterday in Obama signalling that he wants to delay a formal global climate agreement until next year at the earliest, rejecting the advice of his own science adviser, John Holdren.

Erratic monsoons, the highest summer temperatures for 50 years, disrupted summer rainfall patterns - just some of the impacts of climate change which are threatening the Indian city of Delhi.

In this second Voices for Change video, Delhi born photographer Ishan Tankha describes how the weather in India has changed during his lifetime, and ponders the consequences for himself and his fellow citizens.