LONDON (Reuters) - Massive post-pandemic stimulus packages are mostly failing to support action to tackle climate change or halt the loss of biodiversity, but the amount of green spending is slowly tracking upwards, according to a study here published on Friday. Advocates of rapid action to slash planet-warming emissions see the packages as a once-in-a-generation opportunity to invest at the scale needed to a catalyse a shift to a low-carbon economy in time to avoid catastrophic global warming. Of a total of $14.9 trillion in stimulus spending announced globally since the pandemic began, so far $1.8 trillion is being used to mitigate the impact of polluting sectors such as energy, transport, industry, farming and waste, the report found.Nevertheless, moves by countries including the United States, Canada, China, Japan and others to support sectors such as renewable energy, electric vehicles or afforestation suggest recoveries are becoming more green-tinted, said the study by think tanks Vivid Economics and Finance for Biodiversity. “We are seeing momentum building towards a greener stimulus package, but there’s still a long way to go,” Jeffrey Beyer, an economist at Vivid Economics and co-author of the report, known as the Greenness of Stimulus Index, told Reuters. Although U.S. spending has so far mostly propped up business as usual, President Joe Biden’s moves to act on climate change and environmental protections since taking office in January sharply improved the country’s ranking.Canada’s ranking also gained after the government announced a range of green investments in sectors including energy efficiency and ecosystem restoration. Japan was ranked the top green stimulus country in Asia after adopting measures designed to boost cleaner energy and transport, although the gains were outweighed by the country’s continued backing for fossil fuels. China’s score, also weighed down by its support for heavy industry, improved due to plans to expand wind and solar