It has been a really bad week for the climate. Each day brought depressing news as scientists meeting in Copenhagen told us global warming is taking place more rapidly than expected. The seas are rising faster than predicted; the polar ice caps are melting more quickly; and the Amazon rainforest is doomed unless urgent action is taken.
The main solutions are widely agreed. The world needs to forge a much tougher treaty this year to replace the failed Kyoto Protocol. Global emissions of carbon dioxide must be cut by at least half by the middle of the century, much more in industrialised countries. Using energy more efficiently is essential, as is rapidly increasing it from renewable sources. Nuclear power and biofuels are much more controversial, but are likely to be used to some extent. But new, much less familiar solutions are also emerging.
Click on the image to see the ten ways, plus a list of the six key people in the Climate Change process