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Energy efficiency means using less energy to achieve the same ends – though rebounds effects can reduce the savings
Two errors were discovered in the IPCC's latest assessment report but the world's science bodies have backed the organisation
The intermittency of renewable energy sources can add costs and complications but not enough to offset their benefits
Unregulated markets have overproduced CO2 because the costs are not priced into the transaction
Global dimming is a reduction in sunlight reaching Earth's surface, almost certainly caused by air pollution
A carbon footprint is an estimate of the total climate impact of an activity
The temperature record and various different climate indicators all point to rising temperatures
UK emissions have fallen fast since the 1990s though it's not clear that current policy can maintain these reductions
Scientists are concerned that global warming could cause much of the world's permafrost to thaw
The rate of change – and the contribution of man-made emissions – makes current global warming unique
Temperature records go back decades and earlier periods can be examined using 'proxies' sources such as ice cores
Frozen permafrost soils contain huge amounts of carbon, which could be released as CO2 if the planet keeps warming
Unlike most of the world, Antarctica has cooled in recent decades, possibly due to the effects of the ozone hole
Developed countries will need to fund their own adaptation and contribute to funds to help poorer countries adapt
Adaptation involved changing infrastructure and practices to limit the risks posed by climatic changes
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