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Values of key climate indicators

Values of key climate indicators

Indicator

Time period

Value

Ranking

Global mean surface-temperature anomaly (1981–2010 baseline)

2017,
annual mean

+0.46°C

Second-highest on record

Global ocean heat content change, 0–700 metre layer

2017,
annual mean

1.581 x 1023 J

Highest on record

Global mean CO2 surface mole fraction

2016,
annual mean

403.3 parts per million

Highest on record

Global mean sea-level change since 1993

2017, December

8.0 cm

Highest on record

Arctic sea-ice extent summer minimum

2017, September

4.64 million km2

Eighth-lowest on record

Source: WMO Statement on the State of the Global Climate in 2017

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