Grass has many advantages.
1> Its provides air conditioning effect for free. Its keep environment cooler safer and cleaner.
2>Grass is better than other plants in cleaning green house gases.
3> It cleans air, removing dirt and dust.
4> It stops erosion and corrosion of soil.
5> Grass roots removes impurities and helps in recharging underground water supply.
6>Grass also helps providing bugs and worms for birds.
and more …
So now you can imagine how the world will be without grass.