As users, there is a limit to what we can do but we can do something! For example, we can try to spend our time online efficiently and constantly remind ourselves what we are doing and why we are on a particular website, as with every click energy is consumed.
Alternatively, we can use sustainable internet services, such as the search engine Ecosia which uses the income generated from searches to plant trees. There are also tools and browser addons which show what kind of energy is used to power our (favorite) websites and based on that, we might want to find an alternative.