By Marco Silva
BBC Climate Disinformation Specialist
Secretive internet vigilantes have made it their mission to fight climate change denial on Twitter. But, as a vicious information war rages online, do they risk becoming the very trolls they claim to be targeting?
I meet Maria and Arthur at the top of a hill overlooking the Mediterranean Sea, in a small coastal town in Spain.
They ask me not to reveal their real names or their exact whereabouts. Over the years, they have made countless enemies on the internet, and they believe stepping out of the shadows could prove dangerous.
"For you to be able to do your work, and not be scared of the consequences, you really have to fly under the radar," Maria tells me.
In 2019, she helped set up Team Ninja Trollhunters, a group of 25 people from around the world who came together to fight climate change denial on Twitter.
"For me, it was a necessity to show that many things that are being tweeted are wrong," Maria says.
Like some of her fellow vigilantes, she has a background in science, which comes in handy when looking through complex research.
But, with her blue Snoopy t-shirt, Maria does not immediately strike me as a "ninja" - and neither does her softly spoken partner, Arthur, whom she recruited into the group.
"We fought many battles together and we also had a lot of fun," he says.
When the group first came together in 2019, part of its time was spent fact-checking false or misleading claims they found on Twitter.
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