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Politics : The Trump Presidency -- Ignore unavailable to you. Want to Upgrade?

To: combjelly who wrote (67447)	4/18/2018 4:31:24 PM
From: TimF	1 Recommendation Recommended By i-node Read Replies (1) \| Respond to of 364727

Its not "CO2 was high until plants evolved and spread". CO2 was high for billions of years even after algae and phytoplankton (which still produce most of the oxygen) were spewing out O2, and for the better part of a half billion years after land plants began establishing themselves on land. Yes those are slow processes, but billions of years was more than enough, and CO2 levels were not steadily going down during that period, they dropped (to levels still higher than today's), then they climbed over periods on the order of geological periods. During all of these high CO2 periods you had temperatures much higher than today and also temperatures colder than what prevailed in the last ice age. Yes CO2 is a greenhouse gas, yes human emission of it produces a force for warming, but none of that supports a number of the disaster scenarios that are casually thrown around.