Most big oil companies have active hydrogen and carbon-sequestration efforts under way.

ECONOMIST: The environment

As mentioned, carbon-14 is radioactive, and as the Sun becomes more active (interglacial times) so does the amount of the radioactive carbon-14.

FORBES: Climate Scientists Deepening Skepticism of Democracy

Other initiatives under active consideration include global taxes on: gasoline, multinational corporations, carbon dioxide emissions, "securities transactions" and "portfolio investments, " use of air corridors and maritime shipping and currency transactions.

CENTERFORSECURITYPOLICY: Hidden agenda

Assuming that all these will change if the latest signs of SAARC trying to be active at Cancun mean anything, there still remains an even more serious challenge: rising carbon emissions.

BBC: South Asian bloc active at climate meeting