http://www.21stcenturychallenges.org/challenges/engineering-our-climate/focus/ en d.over@rgs.org Copyright 2009 2009-03-04T13:24:40+00:00 http://www.21stcenturychallenges.org/60-seconds/carbon-capture-storage-ccs/ http://www.21stcenturychallenges.org/60-seconds/carbon-capture-storage-ccs/#When:10:18:08Z 60 second guide to Carbon Capture Storage 2008-08-29T10:18:08+00:00 http://www.21stcenturychallenges.org/60-seconds/sulphur-screens/ http://www.21stcenturychallenges.org/60-seconds/sulphur-screens/#When:14:37:38Z Could a screen of chemicals in the stratosphere help to cool the earth? 2009-02-18T14:37:38+00:00 http://www.21stcenturychallenges.org/60-seconds/ocean-fertilisation/ http://www.21stcenturychallenges.org/60-seconds/ocean-fertilisation/#When:14:58:25Z How could fertilising the oceans help fight climate change? 2009-02-19T14:58:25+00:00 http://www.21stcenturychallenges.org/60-seconds/artificial-trees/ http://www.21stcenturychallenges.org/60-seconds/artificial-trees/#When:16:04:08Z Artificial trees that could extract CO2 from the atmosphere. 2009-02-20T16:04:08+00:00 http://www.21stcenturychallenges.org/60-seconds/increasing-cloud-reflectivity/ http://www.21stcenturychallenges.org/60-seconds/increasing-cloud-reflectivity/#When:17:53:05Z Professors John Latham and Stephen Salter have designed a fleet of ships that could pump fine particles of sea-water into clouds 2009-02-20T17:53:05+00:00 http://www.21stcenturychallenges.org/60-seconds/increasing-reflectivity/ http://www.21stcenturychallenges.org/60-seconds/increasing-reflectivity/#When:10:57:04Z Could we cool the planet by increasing the reflectivity of urban areas? 2009-02-23T10:57:04+00:00