WWF World Wildlife Foundation
WWF is an old and trustable organization which have cared for nature for many years. You can find a lot of information on their page for your students to read. They are a valid source of scientific information. They also have teaching materials ready to use if you need inspiration.
Extinction Rebellion is an activist group with strict rules of non-violence. They use civil disobedience to draw attention to the need to act against the climate crisis.
They do not have any teaching materials on their homepage but they can be used as a source for reading about activism.
UN United Nations: 17 Sustainable Development Goals
United Nations have made some fine teaching materials about sustainability .
Massachusetts Institute of Technology
MIT has made an incredible program which can calculate the temperature on the planet depending on human activities. Of course, this is a simulation and should be regarded as such and not as a certain prediction of reality.
The horrifying thing about this program, is that there is nothing we can do if we do not stop burning gas, coal and oil.
By 2020 We Rise Up
On this page you can keep yourself up to date with what goes on with climate activism.
Your students can get an overview of what goes on using this page.
NASA Time Machine
NASA has made a very illustrative program which show the change in water level, change in CO2 level, change in temperature and mass of the global ice sheets with the current emissions of CO2. My students love to play with it. I use it as an apetizer for talks and further education on the climate crisis.