Russia is targeting Ukrainian cities and civilian infrastructure with Iranian-made loitering munitions. Are these weapons effective in shaping the war? 

Reducing global emissions of methane, a powerful greenhouse gas, could provide one quick win in the fight against climate change.

Scientists say the rain forest is approaching a critical tipping point at which the damage is irreversible.

The Chinese government’s increasingly aggressive diplomacy has hurt its image in much of the world. It’s unlikely to improve anytime soon.

Fires in the Amazon have aroused international concern because of the rain forest’s outsize impact on climate, but political tensions are hampering the response.