In my opinion Espoo is clean a city.

Remember to use articles before nouns.

First of all, there are wastebins for sorting waste near each house.

I am assuming 'waste sorting' means there are places to put your rubbish. It's better expressed like 'bins for sorting waste'.

It i's really easy and doesn’t require a lot of effort from people.

Inconsistency with contractions : do them or don't do them.

The second onSecondly, there is alternative energy.

'The second one' would only sound right after introducing something as 'the first one'. I know you have use 'first of all', but it sounds a lot better to say 'secondly' after 'first of all'.

Finland will become less and less reliancet on fossil fuels each year.

Reliance is a noun, but you need to used the adjective here.

For example, all electricity in our apartment is given fromenerated by wind power.

It's far more common to say 'generated by'.

The third one isird, there are electrical cars.

Again, this reads better as 'Third'.

It isThey are a really popular type of car in Finland.

What you wrote is correct apart from missing the indefinite article 'a' before 'really'. But I had to change your sentence because of the changes I made to the previous sentence. I introduced cars as a plural ' there are electrical cars' so now, when referencing them, we have to use the plural pronoun 'they' are the corresponding conjugation 'are'.

And the last one isFinally, there are forests.

There are a lot of forest and parks, which help to improve goodthe quality of air and the environment.

Remember definite articles like 'the'. It sounds strange to say 'improve good quality of air' : it sounds like you are saying that the quality of air is already good, but you need to improve it anyway. If you wanted to say that, you could say : 'improve [an already ] good quality of air,'

Of course there are many points, whereother points that should be improved.

This reads very much like spoken English, and it's not quite grammatically correct. The issue lies in the use of "where" which sounds clunky and informal. In this context, the intended meaning is better conveyed by using the relative pronoun "that":

But amount of themFossil fuels are still being consumed,¶
but the amount used decreases each year.

This reads better as one sentence. Also, remember the definite article 'the'. It doesn't sound right to use the pronoun 'them' with an indefinite quantity of fuel being consumed.

In my opinion Espoo is clean city.

You need an "a" so something like, "Espoo is a clean city."

First of all there are waste sorting near each house.

Maybe say something like, "First of all there is waste sorting near each house." You could also combine it with the next sentence to say, "There is waste sorting near each house, which is really easy and doesn't..."

Finland will become less and less reliance on fossil fuels each year.

"reliant."

For example all electricity in our apartment is given from wind power.

I would say, "Comes from wind power," rather than is given.

It is really popular type of car in Finland.

You need ,"They are a really popular type of car in Finland."

There are a lot of forest and parks, which help to improve good quality of air and environment.

Maybe change to "Which help to improve the quality of the air and the environment."

Of course there are many points, where should be improved.

Many areas? maybe instead of points. Then say, "Which should be improved."

But amount of them decreases each year.

But the amount of them decreases each year

In my opinion Espoo is a clean city.

You can say "is clean" or "is a clean city".

First of all there areis waste sorting near each house.

Finland uses nuclear power plants and electricity generation from biomass, hydro and wind power.

Finland will become less and less reliancet on fossil fuels each year.

Reliance is a noun, reliant is the adjective.

For example, all electricity in our apartment is given from wind power.

A comma is usually used after "for example".
"given" is unnecessary in this sentence.

The third one is electrical cars.

It is a really popular type of car in Finland.

There are a lot of forest and parks, which help to improve goodthe quality of the air and environment.

"good" is unnecessary.

Of course there are many points, where that should be improved.

You could say "where there can be improvements" instead.

But the amount of them decreases each year.