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Without further ado, this is the Naked Scientists.

Hello, welcome to the Naked Scientist.

This is the program where we bring you the biggest breakthroughs and talk to the major movers. Thank you, we ask whether the will to tackle the problem is drying up. At the opening of this year's COP Climate Summit in Brazil, President Lula warned the world that climate denialism has to be defeated,

but the leaders of China, the United States and India, weren't in the world that climate denialism has to be defeated, but the leaders of China,

the United States and India weren't in the room to hear it. Those nations currently produce a whopping

50% of all global emissions, and detractors believe that their absence may suggest they're not

entirely on board with efforts to curb climate change.

Martin Stue is the science correspondent at ITV News.

He recently returned from a brief trip to the COP meeting in the Amazonian city of Belém.

I started by asking him whether these types of conferences are actually leading to any long-term climate action.

The really big one, I suppose, in more recent memory,

if you remember it was Paris, which was 10 years ago,

...