Scientists sounded alarms Tuesday with a pair of studies challenging the idea that climate change is occurring gradually over the century and that its worst effects can be avoided by keeping emissions below a critical threshold.

Climate history has been commonly recorded by tree rings, ocean sediment and ice cores.  Climate changes to the environment can be punctuated by big, sudden changes, including ocean circulation shifts and mass extinctions.

This is a local, domestic and international effort. Hopefully, China and India will pursue more laws and end up creating more jobs to reduce pollution and carbon footprint.

http://www.latimes.com/science/la-me-climate-urgency-20131204,0,7482587.story#ixzz2mZp2G6Ja