Picking up litter can be a good example to others. However, the main effort of the Christian life should be becoming a better person by walking after the Spirit rather continuing in the flesh.
Ironically, walking or living in the Spirit is quite involved in physical matters. It's nothing more than living in the truth.
"Corruption" in the Bible can mean many things and this can include pollution.
There's a strong correlation between national corruption, crime index, and danger index of a nation and religion. Ironically, the most Christian nations are also the most corrupt and most dangerous right alongside Afghanistan.
If you're thinking that extreme danger makes people closer to God you might have to rethink that relationship when the leaders of these nations are also Christians, even worse, organized crime bosses and its members are also Christians who regularly attend church and even donate to charity!!
And the scariest part of all these is that people by instinct will not follow religions that don't agree with their personal convictions. They'll abandon religions that does (John 6:66).
I'm not saying that Christianity is the wrong religion otherwise I won't be quoting from the Bible anymore. But consider the prophecies that the movement that Christ started will be corrupted. Read the whole chapter of Jude 1. And judging by the results, it would seem the majority of Christianity is corrupt already. I'm not making these up. I'm still using the same logic used in the Bible and stating facts by the numbers and most importantly, it was prophesied.
On the flip side, the least religious nations (excluding communist nations) are also the least corrupt, safest, cleanest/least polluted, lowest poverty rate, highest per capita income on average, highest quality of life, lowest in human rights abuses. If there is a problem like poverty, they fix it and not just for the show and not just with chump change, unlike what the Pharisees and hypocrites do. Everyone is quite involved. Matthew 25:31-46 comes to mind. They didn't know they were serving and loving the Lord and could very well be a prophecy of the last days.
It's really disturbing when in highly Christian nations, greed is rewarded while in least religious, non communist nations, selflessness is rewarded. Something huge is definitely going on. The Lord is definitely moving something but escapes the attention of those who are supposed to "believe" in Him.
If walking in the Truth and Spirit, everything will fall into place and there will be transformation and evil people will try to take it by force.