The third sentence is informal; it shows that you and the person you are speaking to are familiar with each other, and you don't need to make an effort to be polite or respectful.
The Mayor of London wants to tackle or make an effort to deal with air pollution in this very busy spot, where the amount of traffic is definitely a problem!
That led to both constructive habits, including making an effort to spend more time with the other person, as well as some that were destructive, like unleashing frequent criticisms.
But if you find that an introvert is actively making an effort to talk to you or making a gesture to grab your attention, you can bet he or she likes you.