Human influence has warmed the climate at a rate unprecedented in at least the past 2000 years

Change in global surface temperature

relative to 1850-1900

1.0C

Reconstructed

multi-model average

Observed

0.5

0

‘Very likely’ range

for reconstructions

-0.5

1AD

500

1000

1500

2020

1.0C change in global surface temperature relative to 1850-1900

Reconstructed

multi-model average

Observed

0.5

0

‘Very likely’ range

for reconstructions

-0.5

1AD

500

1000

1500

1850

2020