Morning mail: Biden pledges to halve US emissions, vaccine rollout rejig, ignoring advice

Friday: Australia under pressure after virtual climate summit. Plus: Johanna Leggatt on tuning out the constant stream of self-improvement advice

Hello, it's Imogen Dewey here with the main stories on Friday 23 April: all the action from the climate summit overnight, Australia's (and the UK's) deteriorating relations with China, and new flight rules amid India's Covid crisis.

Scott Morrison told more than 40 world leaders at a virtual climate summit (after a technical glitch) that Australia is on the pathway to net-zero" emissions, and blamed carbon taxes for destroying industries and jobs. Morrison earlier confirmed that Australia would not increase its emissions reduction target - in sharp contrast to Joe Biden, who vowed to slash US emissions by half to meet existential crisis of our time". Biden's 2030 target is the strongest contribution yet towards meeting the 2015 Paris climate agreement and holding global heating below 2C, scientists say. In a break from the Trump era, the US president and summit host warned that time is short" to address the climate crisis and urged other countries to do more. The Australian government is under pressure to do just this, but critics say the PM has instead employed Trumpian misrepresentation": Adam Morton examines exactly how well Australia's climate credentials stack up.