climate

Renewable energy comes from sources that nature replenishes on a human timescale, such as sunlight, wind and water. Here is how it works and why it matters.

El Niño is a periodic warming of the tropical Pacific that shifts rainfall and storm tracks worldwide. It is natural, irregular, and distinct from climate change.

How a thin blanket of gases keeps Earth warm enough to live on — and why adding more of them is changing the climate.

Inside the photovoltaic effect: how a slab of treated silicon converts light into usable electric current, with no moving parts.

Buying a credit to cancel out emissions sounds simple — but the value of an offset depends on claims that are hard to verify.