Hey,
I am very interested in projects, people and organisations using tech for good. I've found the great guys from conservify. They used arduino to build sensors and help science and research for environmental issues.
Do you know any more organizations or people like these who use arduinos to save the environment?
I am looking forward to your suggestions!
See this recent article in the Economist, describing several such citizen science movements.
In the netherlands there are some groups working with sensors for air quality. Can you read Dutch?
robtillaart:
In the netherlands there are some groups working with sensors for air quality. Can you read Dutch?
Nope, but I have Google Translate 
Have you some links for me?
naturlotsen:
Nope, but I have Google Translate Have you some links for me?
http://behouddeparel.nl/?q=VW2017_f07df1c504