Most countries have no fossil fuel reserves, but no country in the world is without renewable energy resources. For a country such as Iceland, the world leader in renewables, this statement is clear to see. The island nation has made good use of its volcanoes and glaciers, which help provide 100% of its electricity and almost all its heat energy. But what about other countries that don't have Iceland's unique geology to rely on. Josh Toussaint-Strauss finds out how the world has managed to reach the impressive milestone of more than 40% of global electricity demand coming from clean power sources, and how other countries such as the UK are making this energy transition happen, despite a distinct lack of volcanoes

• Clean energy powered 40% of global electricity in 2024, report finds

As demand for smartphones, laptops and electric vehicles has soared, so has demand for the minerals - such as cobalt and coltan - for the batteries that power them. The Democratic Republic of the Congo has vast reserves of these minerals, and their extraction is fuelling the country's civil war. Josh Toussaint-Strauss finds out more about how global demand for tech is causing human suffering in central Africa, and how we, and western powers and companies, are complicit

Net zero is a target that countries should be striving for to stop the climate crisis. But beyond the buzzword, it is a complex scientific concept – and if we get it wrong, the planet will keep heating.

Biodiversity and environment reporter Patrick Greenfield explains how a loophole in the 2015 Paris climate agreement allows countries to cheat their net zero targets through creative accounting, and how scientists want us to fix it

In Sudan, fighters from the Rapid Support Forces (RSF), a paramilitary group, appear to have filmed and posted online videos of themselves glorifying the burning of homes and the torture of prisoners. These videos could be used by international courts to pursue war crime prosecutions.

Kaamil Ahmed explains how the international legal system is adapting to social media, finding a way to use the digital material shared online to corroborate accounts of war crimes being committed in countries ranging from Ukraine to Sudan

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