Well President Trump seems set of saving oil and gas companies. Because flaring and so on are happening anyway, here is an idea:

When the methane gas in natural gas is burned it produces water vapour. Methane is the main constituent of natural gas.
CH4+2O2 gives CO2+2H20. Now convectional rain can be brought about merely by having a piece of darker ground heating up more than surrounding lighter coloured ground (urban heat island, etc). Why not encourage fracking companies to burn the waste gas in long pipes with lots of holes in to form a sort of huge grid with thousands of flames coming out? This will humidify a large volume of air and could cause convectional rain if relative humidity is high (relative humidity usually increases when air gets colder at night). More trees could be grown with more rain (perhaps in deserts) to offset carbon dioxide made from the “rain enhancement gas grid”.