I have used a simplified graphic of the traffic signal/light whose meaning is known immediately and internationally, to highlight the "GO GREEN" message.
To start, Germany's national colours - red, gold and black are used.
The topmost, red 'light' with its nuclear symbol, indicates the call to put a 'stop' to nuclear power.
The yellow 'light', depicting simplified smoky chimney-stacks, is a warning against the use of climate-changing charcoal.
Beneath these two �hold back� lights, the colour and concept of green - the �go light� depicts the recycling/sustainabilty symbol.
The logo is simple, precise and speaks with authority.