Where such action by sizeable investors leads to 'copycat' action by others, this can create a self-reinforcing trend that will affect companies' access to capital.
At present, such 'policy-based' divestment is largely confined to those companies with direct exposure to the most carbon-intensive parts of the energy value chain (thermal coal, oil sands etc). However, it is easy to see how these initial steps might extend to other companies in the energy value chain and also to companies exposed to issues that have investment relevance and also resonate with (retail) end investors. Tropical deforestation might be one such issue.