Tropical rainforests play a critical role in regulating the global climate system—they represent the Earth's largest terrestrial CO2 sink.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/new-research-finds-tall-and-older-amazonian-forests-more-resistant-droughts
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/phys
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forests
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/amazon
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tropical-forests
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-sinks
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/droughts