Fake Coal

Fake coal is obviously a really useful prop for fossil fuel focused actions. Lots of different types have been made:
Edible fake coal
Homemade Christmas Coal recipe
Versions that can be thrown safely

Sponges coated in thick paint
Chunks of scrap polystyrene, painted black
Papier mache, painted black (gloss will reflect and shine)

Version to make larger lumps of coal
Take some recycling - plastic milk bottles, newspaper, card etc, squish it altogether and bind with gaffa tape. Cover the lump in recycled paper and paint with black paint mixed with pva - or if in a hurry and no time use black bin liners to cover the lumps. This is a very light and cheap method.

Existing stock
There are also a lot of large chunks of fake coal in the warehouse available for use, contact Creative team.