http://maps.grida.no/go/graphic/strategic-options-for-climate-change-mitigation-global-cost-curve-for-greenhouse-gas-abatement-measu

potential) and the figure is rising by 1.5–2 ppm annually. Reputable scientists believe the Earth’s average temperature should not rise by more than 2°C over pre-industrial levels. Among others, the European Union indicated that this is essential to minimize the risk of what the UN Framework Convention for Climate Change calls dangerous climate change and keep the costs of adapting to a warmer world bearable. Scientists say there is a 50 per cent chance of keeping to 2°C if the total GHG concentration remains below 450 ppm.

Two – conserving natural resources

There is growing evidence of another and quite different threat developing: we may soon run short of the fossil fuels (gas and oil) which keep