This vegan recipe makes an excellent environmentally friendly glue for hanging signs, posters, or whatever other purpose.

Wheat Paste Recipe

Prepare 1 cup (2.4 dl) of very hot water.
Make a thin mixture of 3 tablespoons (45 ml) of white flour and cold water.
Pour the cold mixture slowly into the hot water while stirring constantly.
Bring to a boil.
When it thickens, allow to cool.
Smear on like any other glue.
For slightly better strength, add 1 tablespoon (15 ml) of sugar after the
glue is thickened.

After using a portion, reheat the remaining in a covered jar or container to
sterilize it for storage or keep refrigerated.

If wheat flour is not available, other flours will work.