Global
• Global average annual carbon dioxide ( CO2 ) levels are steadily increasing ; they reached 399 parts per million ( ppm ) in 2015 , and the annual value for 2016 is almost certain to be higher than 400ppm . Current levels are likely the highest in the past two million years .
• 2015 was the warmest year on record for the globe since reliable global surface air temperature records began in 1880 . The last 15 years are among the 16 warmest years on record .
• Globally-averaged ocean temperatures and heat content are increasing . Observations reveal this warming extends to at least 2000m below the surface .
• Globally-averaged sea level has risen over 20cm since the late 19th century , with about one third of this rise due to ocean warming and the rest from melting land ice and changes in the amount of water stored on the land .
Future
Australian temperatures are projected to continue increasing with more extremely hot days and fewer extremely cool days . The number of days with weather conducive to fire in southern and eastern Australia is projected to increase . Winter and spring rainfall is projected to decrease across southern continental Australia , with more time spent in drought . Past and ongoing greenhouse gas emissions mean further warming of ocean temperatures . Sea-level rise and ocean acidification around Australia are projected to continue .
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Temperature Graph February 2017
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March 2017 | Business 2 Business with a Twist
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