Business leaders, cities and investors are being urged to back a UN campaign aiming for net-zero greenhouse gas emissions by 2050.
Race to Zero is part of the diplomatic push to increase ambition in the lead up to the COP26 international climate change summit in Glasgow next November.
It is the first major event since it was confirmed the summit was being postponed due to coronavirus.
Nestlé and Rolls-Royce are among the first to endorse the campaign.
Around a third of the world’s GDP is already committed to the principles of Race to Zero, the UN estimates.
UN climate chief Patricia Espinosa warned that the coronavirus pandemic must not lead to delays in committing to emissions cuts.