A year after a teenage Swedish environmental activist told the world's elite in Davos that "our house is on fire," she's repeated this message.

Today, Greta Thunberg told delegates at the World Economic Forum that "our house is still on fire."

"Your inaction is fuelling the flames by the hour," she insisted. "And we are telling you to act as if you loved your children above all else."

Thunberg declared that while planting trees is a good thing, it's nowhere near enough to replace real mitigation measures and rewilding nature to stave off a climate catastrophe.

Growing trees in Africa to offset emissions won't help when more forests are being burned in the Amazon.

That's why she demanded that "World Economic Forum participants from all companies, banks, institutions, and governments immediately halt all investments in fossil fuel exploration and extraction."

"Immediately end all fossil-fuel subsidies and immediately and completely divest from fossil fuels," she said. "We don't want these things done by 2050 or 2030 or even 2021. We want this done now."

In addition, she openly questioned what excuses the delegates would give their children for failing to act, therefore leaving them to deal with a climate crisis that was knowingly brought upon them.

At one point, she scornfully pondered if this was because "it seemed so bad for the economy that we decided to resign the idea of securing future living conditions without even trying."

Thunberg also didn't play favourites when it came to wherever adults might be on the political spectrum.

"We don't need to lower emissions," she stated. "Our emissions have to stop if you are to have a chance to stay below the 1.5-degree target.

"This is not about right or left. We couldn't care less about your party politics," Thunberg continued. "From a sustainability perspective, the right, the left, as well as the centre have all failed.

"No political ideology or economic structure has been able to tackle the climate and environmental emergency, and create the cohesive and sustainable world. Because that world, in case you haven't noticed, is currently on fire."