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I've been watching the extent of Arctic ice cover for many years. It always reaches its minimum in September. 2012 was a big wake-up call, there hasn’t been a lower minimum since then, but this year for example there was a short period in July where the ice extent was at a record low for a few days that month, you can just about see it on this great interactive graph tool:
nsidc.org
Mauna Loa CO2 is another thing I follow. Other measures of global CO2 are available but this one is the coolest, and they’re all basically the same anyway. I remember in school the textbooks said the atmospheric CO2 level was 0.03, so it was a bit of moment when it breached 0.04.
Charctic Interactive Sea Ice Graph
How to use CharcticDeveloped at NSIDC with support from NASA, the Charctic Interactive Sea Ice Graph enables users to more easily access and explore the National Oceanic and Atmospheric Ad
Mauna Loa CO2 is another thing I follow. Other measures of global CO2 are available but this one is the coolest, and they’re all basically the same anyway. I remember in school the textbooks said the atmospheric CO2 level was 0.03, so it was a bit of moment when it breached 0.04.
Global Monitoring Laboratory - Carbon Cycle Greenhouse Gases
The Global Monitoring Laboratory conducts research on greenhouse gas and carbon cycle feedbacks, changes in clouds, aerosols, and surface radiation, and recovery of stratospheric ozone.
gml.noaa.gov
