News Roundup: Too late for ice caps, or will thick clouds save us?

1. It may already be too late to save the ice caps. [Guardian]

2. Could artificially-created 'thick' clouds protect us from climate change? [BBC]

3. London's congestion charge zone extended westwards. [MSN]

4. Low levels of air pollution can increase risk of stroke. [Planet Ark]

More Green News.