On Monday, Canada’s oil and gas drillers gathered at the Hyatt Regency hotel in downtown Calgary, coming off what’s been a down year. But the mood was cautiously optimistic.

Things could be looking up, in the drillers’ eyes. The recent energy agreement reached between Alberta and Ottawa? A “game changer,” said an industry head.

Another game changer? Enhanced oil recovery, or EOR.

Many may be unfamiliar with the term, which refers to technology that captures carbon dioxide from industrial emitters before injecting it underground in order to squeeze extra oil out of reservoirs. The carbon dioxide is then trapped underground.

Green Party Leader Elizabeth May certainly didn’t participate in the celebrations.

Earlier this week, she told The Canadian Press that she viewed the deal as a “significant betrayal and a reversal” after then-cabinet minister Steven Guilbeault was tasked with winning May’s vote for the budget last month.