Bloomberg Climate Clock
A real-time estimate of global carbon dioxide levels and interactive history of the increase of carbon dioxide concentrations in the atmosphere based on data from NOAA, the Keeling Curve, and other sources.
Global Carbon Atlas
The Global Carbon Atlas produced by the Global Carbon Project provides a wide array of visualizations of up-to-date, easily downloadable carbon and CO2 emissions trends.
NOAA Sea Level Rise Viewer
Scalable projections of potential sea-level rise along the U.S. coastline from NOAA.
Greenland Ice Sheet Today
Get satellite images and information from the National Snow and Ice Data Center about surface melting on the Greenland ice sheet. Images are updated daily, and analysis is posted periodically as conditions warrant.
Advanced Global Atmospheric Gases Experiment
AGAGE makes precision measurements of methane, refrigerants and other significant greenhouse gases, collecting data at 11 stations around the world.
Argo
Real-time temperature and salinity data, the “vital signs” of the oceans, from more than 3,500 profilers in the international Argo network is available here.
Environmental Protection Agency
"Temperatures are rising, snow and rainfall patterns are shifting, and more extreme climate events – like heavy rainstorms and record high temperatures – are becoming more common. Many of these observed climate changes are linked to rising levels of greenhouse gases in our atmosphere, caused by human activities. EPA’s indicators provide evidence of these changes and their impacts on people and the environment. EPA partners with dozens of data contributors to compile and keep these indicators up to date."
Climate Central
Climate Central offers several resources: