Many of our iconic buildings including Leinster House are to take part in Earth Hour later today.

Animals, plants may vanish from many parts of the world unless action is taken, writes Douglas Main

Scientists are worried about the amount of carbon dioxide in the atmosphere and how fast it continues to build without showing any sign of slowing, writes James Warner

The floodlit cream shells of the famed Opera House dimmed today as Sydney became the world’s first major city to plunge itself into darkness for the second worldwide Earth Hour, a global campaign to highlight the threat of climate change.

Householders around the country are being urged to take part in Earth Hour.