Why Is it necessary not to change ?

I think people want a strong sense of entitlement that they are a part of the universe playing a significant role in shaping the course of evolution or just said they want to feel they are 'somebody'. But.

See this perspective

You are in space with that heavy white suit on. Now, you gotta get outside to fix thing up with some anomaly occurring at ISS(International Space Station). So, you are outside now. "Stay with me". Now, you look down upon Earth, that blue green giant marble. Here's a thinking that would pop up. What are they doing? right now? As you imagine more with curiosity and picture it. 

What picture that be?

 Tiny people with tiny briefcase. Someone is hugging. Some in park, playing, laughing, little quarrel. someone is running, rush rush hour. 

All are tiny people? right?

now every tiny ones are running or enjoying or celebrating or in misery or just sad or a kid looking at rooftop or just jerking off in public. Whatever...

Now back to business. You were at ISS looking down to earth. Now even if I tell you there is one in the park who was honoured with Nobel Prize. yea! respect for that generous guy. But, does it matters to you when you see people from above. It's just these tiny creatures are just ANIMAL. That's it. I think human consciousness and awareness made a gradual development. Therefore the final product is this GLOBAL WARMING. 

We are just creatures just running for something that will give us a sense of  'gratification'.