[phaster]

The plan to suck CO2 out of the atmosphere and use it to rebuild Earth’s coasts

“You’re going to produce, give or take, somewhere in the vicinity of 100 billion tons of limestone if you convert all of the CO2 that we’ve emitted into the atmosphere [in one year] into rock.”

“The processes continue to be extremely energy intensive,” Sant says. “I think we’re still looking at average costs north of $250 per ton of CO2, and this is being very optimistic.”

http://www.digitaltrends.com/features/c ... limestone/

so in other words,...

100,000,000,000 (one hundred billion tons) x $ 250 per ton = $250,000,000,000,000

NOTE

Latest official GDP figures published by the World Bank,... is $80,934,771,028,340 (nominal, 2017) http://www.worldometers.info/gdp/gdp-by-country/

and on the local level (for example my home town) we see unaddressed financial mismanagement issues, that continue building up off balance sheet "debt"

http://www.SanDiegoDebtBomb.com

[dolanbaker]

Short answer:
The global economy is hard coded for infinite growth, debt will always rise as growth is dependent on taking on more debt, the financial system is dependent on the interest from this ever-increasing debt to sustain it. It is the near zero interest rates that are going to eventually cripple the financial markets unless they can change the way things work.

[Newfie]

And if we do not do it?

This is why one should concentrate on divining how to survive the bottle neck.