Exxon (among others) have Billions invested in Natural Gas Refinement. If they don't utilize those resources and technology they've invested in to the fullest they lose money. Is it really that hard to comprehend? Everything is about money, do you really think any of the largest corporations in the World care about the environment...?
And you realise natural gas is actually considered a semi-clean fossil fuel and so they would stand to benefit?
Also, gas and oil are pegged on the markets. Go look at the long term charts, publicly available data.
No-one is trying to cut out fossils fuel immediately, look at European car efficiency compared to ours, that could be a HUGE reduction in people's personal carbon footprint.
You're literally arguing that Exxon support a climate deal because they don't like oil...