Upbeat IPCC report points to an energy revolution.

In its third and final key findings, the IPCC panel reports:■ A cost of $US20-50 a tonne of atmospheric carbon would have a big impact on cutting harmful emissions. "It could lead to a power generation sector with low greenhouse gas emission by 2050."■ This would allow renewable energy to have a 30 to 35 per cent share of total electricity supply by 2030.■ Nuclear power would provide only an