Last year, a private company proposed "fertilizing" parts of the ocean with iron, in hopes of encouraging carbon-absorbing blooms of plankton. Meanwhile, researchers elsewhere are talking about injecting chemicals into the atmosphere, launching sun-reflecting mirrors into stationary orbit above the earth or taking other steps to reset the thermostat of a warming planet.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/experts-ponder-hazards-using-technology-save-planet
[2] http://admin.indiaenvironmentportal.org.in/category/author/cornelia-dean
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/international-herald-tribune-bangkok
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-science
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/scientists