There are many problems around the Baltic sea. The main causes are the industries and farmings around the sea. Many of the industries and farmings are in south Sweden, north Poland, Russia, and other countries around the Baltic sea. These industries leads to pollutions which is really bad for the environment. And the Baltic sea is a part of our environment. It is bad because pollutions are mostly made of bad chemicals that are very toxic for the environment. This will affect both the humans and the animals. The humans can get sick if they swim in the Baltic sea. And the animals can die because of all the chemicals in the water.

Environmental toxins:

The animals around the baltic sea was before endangered by Environmental toxins, for example dioxins. Luckily it was prohibited after a while, but now is it many new environmental toxins that threatens the animals around the Baltic sea.

Problems in Sundsvall: For about 50 - 60 years ago was there someone that dumped some kegs of mercury (Hg) in Sundsvallsfjärden. They have now started to rust and the mercury is leaking out to the Bottenviken.

What can we do?: We need to take up the drums from the water as quickly as possible to prevent that the sea gets poisoned.

Purification of waste water:

The purification of waste water in Sweden uses three main processes: Mechanical cleaning, where the big wastes are removed, chemical cleaning, where chemicals are used to remove for example phosphorus, and biological cleaning, where bacterias are used to “eat” the wastes that’s left. The wastes can be burned to make car fuel (biogas).

Take advantage of the Swedish winter:

The snow cool down generators
Here in sweden we use the snow to cool down generators. This is good because then we don't need to use other things that also need electricity, like vents or fridges. This is something that is not used that much in other parts of the world.

What we did before:
Before we simply pushed the snow back into the sea or a lake. This is bad because the snow could have some environmental toxins that can be bad for the water and the fish will be dangerous to devour. And also the water will be bad for your health.

A game about The Baltic Sea:

We’ve created a game about The Baltic Sea.
If you want to win you have to be first at the finish.
The orange fields are shortcuts.
If you are standing on an orange field with the question mark you have to answer the question.
If your answer is correct you can stay there.
If your answer is wrong you have to go back to the field where you were standing before.
Questions are e.g.:
“Which countries border The Baltic Sea?”
“Give 3 sources of pollution in The Baltic Sea.”
“Give 2 effects of spilling petroleum into the sea.”etc.

Kinds of pollution of the Baltic Sea:

This poster presents kinds of pollution of the Baltic Sea kinds of pollution:
- sewage from human settlements
- fertilisers from agriculture
- acid rains and dust from factories and transport
- oil and petrol from ships
- chemical weapons and sea mines from II World War
- rubbish from beaches and rivers (eg. bottles)


(Blue rectangle)

Oil tankers

On the surface of water the layer of oil reduces the amount of light which gets underwater and makes it impossible to absorb oxygen from the air. The oil which covers the bodies of animals is a threat to the birds, seals and other species which have problems with moving.

The oil which mixes with water pollutes the food of animal species such as mussels, fish and seaweeds making them inedible. The beaches become polluted because of the leftovers of the oil thriwn out of water.

(Orange rectangle)


The Baltic Sea is the „youngest“ sea in Europe and it used to bet he cleanest one. Nowadays, however, it is heavily polluted by the industrial and commual waste. There are many viruses and pathogenic bacteria in the waste which are most dangerous. Moreover the agricultural production makes the water even more contaminated. They pollute the water by dumping chemical fertilizers and insecticides. All the waste flows down the rivers and finally gets to the Baltic Sea. In turn the phenomenon of eutrophication occurs.

The effects of eutrophication:
- dying of species
- phytoplankton bloom
- oxygen overuse
- increase of zooplankton

(Green rectangle)


After the II WW about 50 thousand tons of bombs and missiles were left in the Baltic Sea. They contain about 15 thousand tons of chemical substances which dissolve in water.
Although directly it is not so dangerous for people as we do not have contact with the poisonous substances but unfortunately we are exposed to the risk of eating harmful fish.