Page Updated: Tuesday, July 01, 2025 8:32 PM ET

Guardian UK - Environment

The most important number of the climate crisis: 425.2 - atmospheric CO - 2 - in parts per million, 21 July 2024 - 75.2 - above safe level - 27.1 - in past 10 years - 280 - 300 - 320 - 340 - 360 - 380 - 400 - 420 parts per million - 1960 - 1990 - 2014 - 2024 - Safe level: 350ppm - Latest: 425.2ppm - 280 - 300 - 320 - 340 - 360 - 380 - 400 - 420 parts per million - 1960 - 1990 - 2014 - 2024 - Safe level: 350ppm - Latest: 425.2ppm - Source: NOAA. Chart baseline is 280ppm - the preindustrial average. Safe level a stabilisation scenario set out by IPCC. Daily average CO2 value at Mauna Loa.

11 months ago

The age of extinction

5 months ago

Most viewed -- in environment

2 years ago

Most viewed -- Across the guardian

2 years ago

'Even if we stop drinking we will be exposed': A French region has banned tap water. Is it a warning for the rest of Europe?

20 hours ago

The 'silent killer': what you need to know about heatwaves

4 days ago

After 150 years, a prized box returns to an Indigenous nation in Canada: 'I felt like royalty traveling with it'

11 hours ago

Tracking sea ice is 'early warning system' for global heating – but the US is halting data sharing

2 hours ago

You love the outdoors. So why are you pooping all over it?

12 hours ago

Key climate change reports removed from US government websites

3 hours ago

Country diary: Like wrecked prizes, the body parts of pheasants litter the landscape

17 hours ago

Parking space-sized gardens impress Hampton Court flower show judges

9 hours ago

Flying ants: why this year's mating season could be longer and more frenzied than ever

1 day ago

A 'vigorous' coastal low is hitting Australia's east coast. What does it mean, how worried should we be and is it a bomb cyclone?

23 hours ago