Breakfast cereals may not be so g-r-r-r-eat for the environment: Report calls on Kellogg, General Mills, Post and Quaker to change sourcing practices 05-Aug-2019 By Gill Hyslop The Union of Concerned Scientists (UCS) is calling on four of the world’s leading cereal makers to make ‘relatively small commitments’ in the way they source grains, which would go a long way to combat climate change.