Evidence the world has warmed

Question 1

Increases in surface, atmospheric and ocean temps

Answer 1

10 warmest years since 1800 all since 2000,
SSTs highest in last 3 decades than since records began,
Global surface temp has increased 0.2 degrees per decade in last 30 years

Question 2

Shrinking glaciers and ice sheets

Answer 2

2000-2019 glaciers lost 250 GT of ice/yr
More than 110 glaciers lost from Montana national park in last 150 years
Antarctica is losing ice mass at 150 billion tons per year
Greenland is losing about 300 billion tons per year

Question 3

Rising sea levels

Answer 3

Average sea level rise was 1mm/year since 1900 but recently increased to 3mm/year
Steric effect and loosing ice sheets will increase sea levels
Sea levels have risen 100mm (10cm) since 1993

Question 4

Increasing atmospheric water vapour

Answer 4

Water vapour accounts for 75% of greenhouse effect
Increasing 3% per decade
Every 1 degree rise by CO2 increased another 1 degree by Water vapour

Question 5

Decreasing snow cover and sea ice

Answer 5

Arctic sea ice has reduced 8% a decade since 1979 and increased to 13% a decade recently
Decline in spring snow cover 2% a decade since 1966