Beto O'Rourke: just how green is the Texas Democrat?

The 2020 presidential challenger has praised the Green New Deal but his relationship with the fossil fuel industry has come under scrutiny

It was not hard for Beto O'Rourke to seem like a champion of green issues during his eye-catching Senate campaign in America's 2018 midterm elections - after all, he was up against Ted Cruz, a climate change denier.

Now, as the former US congressman vies to be the Democratic candidate to run against Donald Trump in the 2020 race for the White House, he faces much closer scrutiny on the subject.