Around the same time NASA was planning its moon missions, US oil companies were working on technologies that could have reduced greenhouse gas emissions.
Scientists and engineers had submitted patents for techniques to peel carbon dioxide out of fossil fuel exhaust, boost engine efficiencies, and produce electricity from fuel cells, according to industry documents released
Thursday. They also pondered ways of offsetting the expected effects of increased carbon dioxide levels by pouring sulfur particles into the air to reflect solar energy back into space, or manipulating the weather to control smog.But the industry ultimately settled on raising doubts about whether any effort to rein in carbon emissions was needed to head off the threat of global warming, according to the researchers who have collected those records.

Read More at www.news.vice.com