I am a believer that eventually, whether we like it or not, humans will burn most of the fossil fuels available to us - and consequently release the carbon into the atmosphere.
Interesting fact: for every kilogram of fuel you burn, you release about 3.7kg of CO² into the atmosphere.
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We definitely need to develop stronger sources of renewable energy in order to keep our civilization powered after the fossil-fuel era — but in order to control the amount of CO² in the atmosphere, for pollution and global climate concerns — my thoughts have recently been that we need to show some ingenuity and engineer 21st century solutions. But we may not need a high-tech solution to get us started...