Record-breaking heat and drought have fueled the world’s worst ever start to a wildfire year, as climate change and a developing El Niño threaten to push extreme weather to new heights.

Over the first four months of this year, more than 150 million hectares (579,150 square miles) was burned, according to satellite estimates from the Global Wildfire Information System. That’s an area nearly the size of Alaska and roughly double the seasonal average for this period.