The world may cross the crucial 1.5C global warming threshold in seven years as fossil fuel CO2 emissions continue to rise, scientists warned Tuesday, urging countries at the COP28 talks to "act now" on coal, oil and gas pollution.But China, which accounts for almost a third of global emissions, is expected to see a four percent rise in fossil fuel CO2 this year, the research found, with increases in coal, oil and gas as the country continues to rebound from its Covid-19 lockdowns.