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In the growing clamour over global warming, eye-witness accounts of a changing world stand out.

Despite the abundance of information on climate change, finding ways to meaningfully engage the public on this topic remains a formidable challenge.

The White House-led censorship of climate scientist James Hansen shows what can happen when those who should know better stand idly by.

Last month's UN Climate Change Conference in Bali marked the end of a year that saw the world turn its attention to global warming, largely owing to the overwhelming body of evidence presented by the Intergovernmental Panel on Climate Change (IPCC). For many, the Bali conference offered hope of international action. Olive Heffernan caught up with IPCC chairman Rajendra Pachauri midway through to find out his views on the state of play in Bali and beyond.

The world may be largely indifferent to the presence of humanity, yet we have magnified our influence to global scales - above all, through the recent increase in atmospheric greenhouse gases.