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Shadow chancellor John McDonnell to say ‘overwhelming challenge of climate change’ must be addressed from very centre of government

The risk posed by climate change would be factored into projections from the government’s independent economic forecaster if Labour took office, the shadow chancellor will announce on Tuesday.

John McDonnell will highlight the human and economic costs of manmade climate change, calling it the “greatest single public challenge” and say the government should include the fiscal risks posed by global warming in future forecasts.

Related: From the Everglades to Kilimanjaro, climate change is destroying world wonders

America is deeply divided, but climate-denying Republicans are losing their grip on power

Five months ago, Trump quickly cemented his legacy as the country’s worst-ever president by inexplicably starting the process to withdraw from the Paris climate accords. With even war-torn Syria now signing the agreement, the leadership of every world country has announced its intent to tackle the existential threat posed by human-caused climate change, except the United States.

It's the US vs. the rest of the world, as Syria agrees to sign Paris climate accord https://t.co/Q1tkxuiHas pic.twitter.com/hnV2wHmLHL

The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.

If you show up at a climate conference to talk about coal, you’re likely to be ignored. I think the We Are Still In delegation will get more attention than the executive branch. We’ve gone from the indispensable leader to being the only country not engaged in climate change. Many people in Congress are troubled not only from a climate standpoint but a geopolitical standpoint. China is happy to take that leadership from us.

The rise would end three years of flat carbon emissions – a ‘huge leap backward’ say some scientists, while others say the longer term trend is more hopeful

The burning of fossil fuels around the world is set to hit a record high in 2017, climate scientists have warned, following three years of flat growth that raised hopes that a peak in global emissions had been reached.

The expected jump in the carbon emissions that drive global warming is a “giant leap backwards for humankind”, according to some scientists. However, other experts said they were not alarmed, saying fluctuations in emissions are to be expected and that big polluters such as China are acting to cut emissions.

Related: The COP23 climate change summit in Bonn and why it matters

Related: The seven megatrends that could beat global warming: 'There is reason for hope'

Stumbling on submerged roots, attacked by bees and wading waist-deep through leech-infested water, the three researchers and their Pygmy guides progress at just 100 metres an hour through the largest and least-explored tropical bog in the world.

The group halt and unpack what looks like a spear, which is plunged over and over again into the waterlogged forest floor. Each time it brings up a metre-long core of rich, black peat made up of partly decomposed leaves and ancient plantlife. The deepest the steel blade reaches before meeting the underlying clay is 3.7 metres.