Aramco has spent billions on research and development into cleaner oil production technologies Updated 20 April 2021 April 20, 2021 00:57 DUBAI: Climate change is the big long-term issue of the post-pandemic world, and this weekend we will all be better placed to judge the global state of play when US President Joe Biden convenes the Leaders’ Summit on Climate he promised soon after moving into the White House. Some 40 leaders have been invited to take part in the two-day event, including King Salman. In a demonstration of the importance Biden puts on the issue, and the impact of summitry drama, the event will be available for global public consumption via livestream.