"On Tuesday, President Donald Trump signed an executive order to revive and expedite two multi-billion-dollar underground pipelines[...]
[One] is the Keystone XL pipeline - a new segment of the existing Keystone Pipeline system, which begins in the Alberta, Canada tar sands [.. that's the bit in the picture] [...]Barack Obama killed the Keystone XL pipeline in November 2015."
so Obama saw fit to stop the pipeline (slight chance of eventual recovery and no more damage). But Trump is reinstating it (ah yes 100% chance of more damage).
No point in trying to work out "who started it" but we can see who;s starting it