The more personal your message the better, but here are some points to bear in mind:

• Munich Re promised to back off coal three years ago, but today it's still supporting destructive coal projects via its reinsurance business
• Without insurance, none of these projects can happen -- meaning Munich Re has the potential to make a huge difference to the world
• The world's biggest reinsurer, Swiss Re, has already promised to stop reinsuring coal -- there's no reason Munich Re can't do the same
• Coal is the single biggest driver of climate change, and kills hundreds of thousands of people a year