Does Extinction Rebellion want to prevent extinction? Or encourage it?

‘Scientific evidence confirms that natural cycles, volcanic activity, galactic cosmic rays and changes in solar activity from sunspots have had a negligible effect on our current temperature rise.’ ‘There is nothing magical about the greenhouse effect. We know exactly how to deal with it.’ So states the website of ‘Extinction Rebellion’. Wow! My mind boggles at how the tests for that ‘scientific evidence’ could have been designed, measured and recorded!