We Need To Reduce Emissions

[Shady]

As long as there is cheap abundant oil, the internal combustion engine isn't going anywhere. Why would it?

How will CO2 levels sharply decline? It is quite a stable molecule. Where will it go in such a hurry?

Right. Just like dial up Internet isn't going anywhere as long as it remains cheap.

[Shady]

duh! Emissions accumulate... and will continue to accumulate, year upon year. There is no short days or weeks residence time for CO2; given the so-called long tail residual retention of CO2, cumulative amounts of CO2 will remain in the atmosphere on a time-scale of centuries.

Right. Because you know exactly what anti CO2 technologies will exist 50 years from now.

[waldo]

Right. Because you know exactly what anti CO2 technologies will exist 50 years from now.

anti-CO2? You can continue to look wistfully into the future for that silver bullet technology. Again, until it arrives, if it ever arrives, there is an accumulation of atmospheric CO2, one that will continue to accumulate until your silver bullet arrives... probably long after your silver bullet arrives given practicalities of world-wide deployment of your "sumthin". And as I said, (a part of) that accumulation has an atmospheric residence time in the centuries timeline. Of course, I expect your flight of fancy, ignore/do-nothing today sentiment also presumes upon some magical geo-engineering solution where all that accumulated atmospheric CO2 will simply be "removed"! Make it so, Shady... wish harder!