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Mosquitoes are the last thing you'd associate with the Paris of the West. But it turns out that health authorities there are fumigating vulnerable areas of the city for the first time to kill disease-carrying tiger mosquitoes who have started plaguing parts of northern Europe. Municipal fumigation, whose white smoke is something we in the tropics are familiar with, has led to roads being closed and people told to stay indoors when 'spraying is on'. This is after two people so far have fallen sick with dengue after returning from a foreign trip.

A plant with many names: hemp, cannabis, marijuana, weed, ganja. And it has an equally diverse range of end products: textiles, paper, medicine, energy and oil. It’s also been demonized and criminalized. Now, the "miracle plant" is making a comeback.

It's a wonder material we use every day – and single-handedly responsible for more than 7 percent of the world's greenhouse gas pollution. But the solutions to clean up the steel industry are still in the early stages. How can we make steel green?

The oceans supply just 2% of global food. With fish farming now the fastest growing food production activity in the world, that could change. But even though it’s been practiced for thousands of years, fish farming poses environmental challenges.

The world faces two big challenges: war and climate change. Who's profiting from the war in Ukraine? Could Europe reduce its reliance on foreign gas through offshore drilling? Do carbon offsets really work and how do you dispose of old wind turbines?