In a move that's sure to heat up the climate debate, Greta Thunberg has reportedly taken her activism to new, fiery heights by setting her own boat ablaze in the middle of the ocean, all while pointing fingers at global warming and shouting her famous catchphrase.

Witnesses aboard nearby yachts claim the 20-year-old Swedish sensation was seen dousing her eco-friendly sailboat with what appeared to be sustainable, plant-based accelerants before striking a match and watching it go up in flames. 'It was like performance art meets arson,' said one bewildered onlooker, sipping a cocktail from a plastic straw.

As the boat crackled and popped like a giant marshmallow over a campfire, Thunberg allegedly stood on the deck, arms flailing, screaming 'How Dare You!' at the rising smoke, as if the carbon emissions themselves were personally offending her. Sources say she blamed the inferno on everything from fossil fuels to that one guy who leaves his air conditioner on while vacationing in the Arctic.

Environmental experts are divided on the stunt. Some praise it as a bold metaphor for the planet's impending doom, while others wonder if Thunberg just really hated that boat. 'It's genius,' gushed one climate scientist. 'Nothing says 'save the Earth' like contributing to sea-level rise with your own personal bonfire.'

Thunberg's team issued a statement denying any intentional pyromania, claiming the fire started spontaneously due to 'extreme weather conditions caused by climate change.' They added that the boat was insured under a policy that covers 'acts of God and overly passionate teenagers.'

Critics, however, are fuming. One conservative pundit tweeted, 'If she really cared about the environment, she'd stop burning things and start planting trees... or at least use an electric boat next time.' Thunberg fired back with a single emoji: a flame followed by an eye-roll.

As rescue teams fished her out of the water, Thunberg was overheard planning her next protest: something involving a volcano and a megaphone. 'The world needs to wake up,' she reportedly said, shivering in a towel. 'And if it takes a little controlled burn to do it, so be it.'

In the end, this fiery fiasco might just spark the conversation Thunberg intended, proving once again that in the fight against climate change, sometimes you have to fight fire with... well, more fire.