How? The press release asserts this statistic, but I can't figure out what exactly the 1% are doing that's causing this pollution... There's a vague reference to "plundering" the planet, which makes me think they're saying the actions of polluting corporations are the responsibility of the 1% (and not, say, the 2%....)
But it's irrelevant to climate change because there's nothing that you can do to them that would substantially decrease those emissions. It's not like they're causing a huge amount of pollution from their private jets and golf courses. If you redistribute their shares to someone poorer then the same amount of pollution will be produced, because a factory that produces five million tons of CO₂ does so regardless of the makeup of the owners.