By now, we all know that traveling by airplane has a very big impact on the environment.

​

In fact, according to the International Air Transport Association, the aviation industry causes as much as 3% of global emissions.

​

While airlines and governments have been thinking of new ways to reduce this impact, Denmark has announced a new idea: a "green tax."

​

On November 9, the government said it plans to introduce an extra tax from 2025 for passengers on flights leaving from Denmark.

​

This means that, on top of the cost of their flight, passengers will need to pay about $9 for flights within Europe, up to $35 for medium-distance flights, and about $56 for long-distance flights.

​

The government believes the tax will bring in more than $175 million.

​

Half of the money will go toward a plan to have all domestic flights use 100% sustainable fuels by 2030. If it does this, Denmark could be the first country whose domestic aviation industry is decarbonized.

​

Denmark hopes to have its first domestic route using only green fuels by 2025.

​

The other half of the money will be used for pension increases, the government said.

​

Other countries are doing things to reduce their aviation impact too. Earlier this year, France became the first country in the world to ban domestic flights between places that have a train route that takes less than two and a half hours.