Lib Dems wants to introduce a 5 p charge on the thermal cup, similar to the charge on the plastic bag.
To prevent so many paper cups from being thrown away, customers need to pay an extra 5 p if they don't bring their own portable mug.
The party said that because 2, charges are necessary.
Britain throws away 5 billion cups a year.
It is shocking that less than 400 disposable cups are recycled.
Professional companies are required to recycle disposable coffee cups because the plastic used to laminate the paper must be removed before it is pulled.
Because of this, not all councils recycle paper cups-which could mean that it could end up being landfill even if you try to recycle them.
To be more eco-friendly, some coffee chains-such as Starbucks-can enjoy a 25 p discount if customers bring their own take-out cups.
Baroness Parminter, an environment spokesman for the Liberal Democratic Party, said: "The Liberal Democratic Party brought the cost of plastic bags, which proved to be very successful-coffee cups are the next logical step.
For the Liberal Democrats, protecting the environment and tackling climate change is a priority.
We can and must act.
The Liberal Democratic party added that income from what people now call the coffee cup tax will go to charity.