Thousands gathered at Westminster to kick off the event, called "The Big One", joined by several climate organisations.
This marks the first time that all of G7 members have committed to the 2040 goal.
Twenty-one-gun salute ring out and formation jets trail Brazil's national colours as UAE President Sheikh Mohamed greets Lula da Silva at presidential palace in Abu Dhabi.
After a gap of two years, world leaders, economists and other influential personalities are coming together again to help the world face some of the biggest challenges in decades.
Thousands of people hit German streets last week to protest coal mine expansion as Germany looks to replace Russian gas.
Conference in Geneva puts to test the deal at the COP27 meeting in Egypt that established a special fund to cover climate-related destruction in poor countries that have contributed less to global warming.
International climate pledges remain far off track to limit rising temperatures to 1.5 degrees Celsius, says a UN, less than two weeks ahead of high-stakes negotiations to tackle global warming.
Authorities urge residents to prepare for Ian that is forecast to become a major hurricane within days as it tracks toward the US state.
The country smashed its all-time temperature record in July, when the mercury topped 40 degrees Celsius for the first time ever.
Fast-moving McKinney fire in California state goes from charring just over one square kilometre to scorching as much as 160 square kilometres in a largely rural area near the Oregon state line, say fire officials.
President Biden announces executive actions including $2.3 billion in investments to help build US infrastructure to withstand climate disasters.
Acknowledging the importance of drought mitigation strategies, EU researchers underlined the need to tackle climate change, the root of the problem.
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