Let's suppose one happy day we get to the point where 100% of electricity is generated from renewables, and 100% of the land transport fleet is electric. That would still leave cement production, iron and steel production, sea transport, air transport and forest clearing and burning as emission sources.
Cement is a key problem, because the very process of manufacturing cement produces CO2. Limestone (CaCO3) is heated to drive off the CO2 which leaves cement. But the CO2 driven off adds to the level of CO2 in the air.
Cement production, according to the video below, produces 7% of global CO2 emissions. The Cement Industry Federation reckons it's 5%. Either way, it's significant.
So this new technique may be a major advance:
Hat tip to Climate Denial Crock of the Week
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