I am going to help you rewrite so that you have something that is in line with how informed native speakers (journalists, environmental NGO communicators, etc) write about this subject, as follows: "Alrhough it is true that awareness of the importance of environmental protection is today much greater than half a century ago, and indeed there has been considerable progress in legislation, policy changes and education in many countries, the world is still not doing enough, in my view, to protect the environment."

I agree that Urusa's answer has improved on yours, except that I prefer "develop" (your original) to "address". You "address" (tackle) a "problem", or an "issue", but not a "way" to do something positive. I also think that "harmfulness" is unnecessary as it comes within the idea of devastation. You could instead keep this word but be more specific e.g. "harmfulness to many fragile ecosystems".

"Presently, it is true that many more people have been focusing on environmental devastation and its harmfulness, and many discussions have also taken place to address ways to stop it. Nevertheless, I still don't think the world does enough to protect the environment." Good job in your original! I just condensed it a little bit. I hope this helps you! J.

It is true (to say) that more and more people nowadays are getting concerned about enviromental damage and its consequences , despite the many discourses on how to alleviate the problem. Any how, I dont think the world has done enough to protect our enviroment.