A landmark proposal by ExxonMobil to capture and store millions of tons of carbon emissions  from Houston area petrochemical facilities has won the support of nearly a dozen oil and gas companies, including fellow supermajor Chevron Corp.

Last April ExxonMobil said it was looking for local, state and federal support to build a $100 billion carbon capture and storage (CCS) project to pull emissions from the massive industrial complex along the Houston Ship Channel

The project as designed initially could capture about 50 million metric tons/year (mmty) of CO2 emissions by 2030 and 100 million mmty by 2040. The captured CO2, equivalent to taking nearly 11 million vehicles off the road, could be stored up to 6,000 feet below the Gulf of Mexico.

Eleven companies including...