It really depends on how big your area is and what you mean by changing the climate. You can make your backyard way more pleasant by increasing the plant cover, which will drop temperatures in the summer and provide homes for bugs and animals if you do it right. Fifty acres might be enough for you to notice just a general cooler climate if you replaced mowed grass or farm with a dense forest. It would also help slow evaporation from the soil. But you’re not gonna noticably change the amount of rain until you get into land areas comparable to a US state or maybe large city, unless you have very particular geography.

Thanks for proving fixed links to the both of you!

You need to use your protests as recruiting grounds for more direct pressure on your government. You should establish or join a lobbying organization and recruit volunteers. You will have these people write letters to the editor, solicit for donations, call and write to your representatives, and schedule in-person meetings with government officials.

Standing on the street and yelling by itself is not enough, you need to become a part of the establishment to affect change, but you can grow your organization by finding people who have proven to be motivated. A protest is a great place for that sort of thing.

What’s the context here?