Clean and high

These are skyscrapers with a difference: they can remove large amounts of sulphur dioxide, ozone, soot and other polluting particles from the air

Green sands

Ancient Sahara was wetter and wilder before. Changes in vegetation have played a role in transforming its climate

Exceptional site

Bacteria help precipitate arsenic from the surface water that springs out of mining sites

Within the Earth's guts

The answers to puzzling climatic phenomena may lie inside the Earth and not just in the atmosphere and the sea

Bad news for ozone layer

Bees to detect landmines

Blessed are the meek...

...for they keep the rainforests' biodiversity high

Pushed into oblivion

Trees fight back

After killing trees by the millions, the Dutch elm disease finally meets its match

Heat before the cold

Monkey business

Red heat

Droughts in Africa were far worse in the last millennium than is now

On the tiger's trail

Camera-trapping could augur for a more reliable method Of tiger census

Antarctic assault

The scourge of pollution has not spared even the icy continent

Micturition muddle

Golddiggers

Top of the charts

The long and short of it

A mouthful

Soil that is not soiled

More and faster

Life before life

Crack down

Icy relief

A mammalian problem