There is an upside to the global recession: greenhouse gas emissions are expected to fall with 3% this year. This would lead to emissions in 2020 being 5% lower. This contrasts to a 60 year history of an average 3% growth in emissions a year. While this may be good news for our climate, government budgets suffer as a result. But we need these government budgets. To keep our planet from warming more than 2° Celsius, $400 billion a year between now and 2020 will need to be invested in greening our energy infrastructure.

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