Having developed the first computer model to measure the presence of soot released by such sources as diesel engines and wood-burning fires, US-based Stanford University Professor Mark Jacobson finds that it accounts for up to 20% percent of global warming, with its reduction being one of the fastest and most economical ways to slow climate change and protect human health.  

http://www.voanews.com/english/news/environment/Study-Reducing-Soot-is-Fastest-Way-to-Slow-Climate-
Change-129070528.html
http://www.bitsofscience.org/soot-policy-climate-change-2909/

Reduced visibility due to thick smoke from fires set by slash-and-burn farmers in Indonesia forces the closure of Sumatra Island's Sultan Taha airport on Tuesday, September 3, with parts of neighboring Singapore and Malaysia that are shrouded in smoke as well.

http://www.spa.gov.sa/English/details.php?id=924555
http://www.msnbc.msn.com/id/44497602/ns/travel-news/#.Tm-XHtT-Xh4

As reported by Reuters on September 9, 2011, several recent studies reveal a growing link between climate change and the migration of people from Mexico to countries like the USA as drought and other extreme weather conditions reduce crop yields and cause loss of livelihoods in their homeland.

http://www.trust.org/alertnet/news/mexico-climate-change-drives-migration