One of the things I tried to accomplish when I first began RochesterEnvironment.com 12 years ago was to compile a list of places where individuals could monitor the health of our environment. Eventually, I will build up that list again because everyone should have a chance to see objective data on the state of our environment themselves.
There are no end of opinions, studies, and other indirect data about our environment, but the internet can offer more. Sometimes, instruments to measure environmental factors, such as instruments that measure the temperature of water bodies and the decline in glaciers, can be directly hooked up to the Internet for individuals to look at the date themselves.
Check out this news site by Google to mine the data out there about our environment and get primary data yourself:
Google Earth Engine "Google Earth Engine brings together the world's satellite imagery—trillions of scientific measurements dating back more than 25 years—and makes it available online with tools for scientists, independent researchers, and nations to mine this massive warehouse of data to detect changes, map trends and quantify differences on the earth's surface. "