http://www.bbc.co.uk/news/uk-england-london-37283869
In a statement Black Lives Matter n a statement Black Lives Matter UK said the protest was "in order to highlight the UK's environmental impact on the lives of black people"
"As the largest per capita contributor to global temperature...
From experience I believe that your 4th point is largely down to genetic reasons . No number of people laying down on a motorway would make any difference .