New CO2 Record Prompts a Scientist to Ask, 'What's It Going to Take for Us to Wake Up?'
[html]CO2 levels are now 50 percent higher than in pre-industrial times — a level not seen for 4 million years.[/html]
Source: New CO2 Record Prompts a Scientist to Ask, 'What's It Going to Take for Us to Wake Up?' (http://ht**://www.discovermagazine.c**/environment/new-co2-record-prompts-a-scientist-to-ask-whats-it-going-to-take-for-us-to)