Earth may be near tipping point, scientists warn

A group of international scientists is sounding a global alarm, warning that population growth, climate change and environmental destruction are pushing Earth toward calamitous — and irreversible — biological changes.
http://www.latimes.com/news/local/la-me-0607-global-tipping-20120607,0,4125302.story

Article courtesy of The Los Angeles Times by Bettina Boxall