VENICE, July 10 (Reuters) - The group of 20 rich countries said on Saturday that the economic outlook had improved since they last met in April but warned that new COVID-19 variants could threaten the recovery. “We reaffirm our resolve to use all available policy tools for as long as required to address the adverse consequences of COVID-19,” said the final statement by G20 finance ministers and central bankers meeting in Venice. As expected, the group endorsed a global deal on corporate taxation agreed this month by the Organisation for Economic Cooperation and Development envisaging a corporate tax rate of at least 15%. It also said for the first time that carbon pricing could be part of the policy mix for tackling climate change. (Reporting By Gavin Jones Editing by Toby Chopra) Our Standards: The Thomson Reuters Trust Principles.