There is no agreement on what emission cuts need to be made by when or by whom, and the US is still deeply reluctant to do anything. The author of three influential books, he came up with the phrase "zero waste" - the idea that people can mimic biology and produce, consume and recycle everything without throwing anything away. Instead of seeing waste as a problem, he argues that it can become a resource for someone else, and instead of thinking about recycling, he says it is more sensible to think about design so that products do not need to be recycled - instead they could be used repeatedly or composted.

The Slow Food movement has now expanded across 100 countries and is throwing poisoned darts at the whole fast food culture and the multinational food producers that between them have wrecked so much of the environment. She left government office in 2005, is now a Tehran city councillor and heads the Centre for Peace and the Environment.He shocked the more timid Tony Blair and Gordon Brown when he set an ambitious 60% CO2 reduction target by 2025 - and now he is championing renewables, energy from waste, heat and power systems, and ways Londoners can adapt their homes. But the climate stakes have risen with every new scientific report, and the politicians and environment groups have moved on.

There was even a lengthy exchange about hybrid cars, long before they became the car du jour of Hollywood stars. Nearly 20 years ago, Meyer devised what he believed was the only logical way through the political morass dividing rich and poor countries on climate change. It was a learning process," says DiCaprio, "and I wanted to play the role of investigator - from watching documentaries at a young age, from seeing films on rainforests in Brazil and really appreciating the beauty of our planet, and then learning more and more about human impact and wanting to do something about it.

More force of nature than wooden presidential candidate now, Al Gore's reinvention as Mr Climate Change is based on a long-standing passion for the environment. She has worked as a farmer since the age of seven, never went to school and has never heard the words "wheat" or "turnip". It would be easy to sniff at someone who seemed to have merely pledged to forgo private jets and made a couple of films about the environment, but we felt the Hollywood superstar who has grabbed the green agenda had to be included because of the worldwide influence he is expected to have.

Too small and it will feel cramped, but too big and your event is at risk of feeling empty and lacking in atmosphere. The world's seventh largest economy now has targets and timetables to shame nearly every country in the world - a 25% cut in emissions by 2020 - and is hailed as a beacon of eco responsibility. One of London’s most respected Spanish restaurants, Sagardi serves up Basque delights across a spacious dining room in East London.Then the Guardian's science, environment and economics correspondents met to add their own nominations and establish a final 50. The 18th century, Grade-I listed home of the Lord Mayor of the City of London features a few larger spaces for private dinners, including the magnificent Old Ballroom, which fits up to 80 seated guests under its arched ceiling.

Under her watch, deforestation has reduced by nearly 75% and millions of square miles of reserves have been given to traditional communities. Beyond its chic interiors and mouth watering menu, The Railway Pub in Putney also boasts space, and lots of it. Ngongo, 36, is a biology academic from Goma, who has travelled the country investigating the corrupt timber industry and taken his findings to London, Washington and Brussels. I showed him pictures of surfing hippos, gorillas in clearings, elephants in the forest and gorillas and chimpanzees caressing their young.On Saturday, the United Nations humanitarian agency OCHA said the number of people displaced by heavy rains and floods in Somalia “has nearly doubled in one week”. Ken Livingstone, 62, has dragged the capital to the top of the major world cities' environment league. Last year the Sea Shepherd Conservation Society became an official law enforcement agency in Ecuador. Aqua Shard combines those stunning views with sophisticated modern British cooking, and offers two semi-private wings - The Tea Wing and The Gin Wing - for groups of 150 and 200 respectively. We're treating the planet as our toilet and we think when we flush the chain the problems disappear, but they don't.