Earth is the third planet from the sun and is the fifth largest planet in the solar system.
The radius of the Earth at the equator is 3,963 miles (6,378 km). The polar radius is 3,950 miles (6,356 km). Earth is not a true sphere but an oblate spheroid. The planet’s rotation causes a flattening at the poles creating a bulge at the equator. The Earth rotates at 1,037 mph (1,670 km/h) at the equator.
The mass of the planet is 6.6 sextillion tons, or 6,600,000,000,000,000,000,000, (5.9722 x 1024 kg). Its volume is 260 billion cubic miles (1 trillion cubic kilometres).
71% of the planet is covered in water and 29% by land. The total surface area is 197 million square miles (510 million square km).
Earth is 4.543 billion years old, which is only 28 billion years younger than the Milky Way solar system itself.
The statistics that describe planet Earth are so large that most people cannot comprehend them and therefore they do not understand its magnitude in physical terms.
A common mistake is for people to confuse ‘the planet’ with ‘the environment’. The planet is actually the host of the environment and exists independently of it.
An environment need not include life nor be life supporting.
Typically, ‘the environment’ is taken to mean the natural world, which is everything that exists that is not made or caused to exist by humans.
When people make claims relating to either destroying or saving the planet, they are confusing it for the natural world.
66 million years ago the planet was impacted by an asteroid with a projected mass of 6.1 trillion tonnes, which created a crater with a 93 mile (150 km) diameter and 12 mile (20 km) depth. The event is recorded as little more than a pockmark on the surface of the planet, only discovered in 1978.
While the impact was of little significance to the planet, it proved devastating for the environment, leading to the Cretaceous-Tertiary (K-T) extinction event that resulted in at least 75% of all species dying.
The planet is too massive to be in any danger from humans. It is either an anthropocentric arrogance or a general confusion over the distinctions between the planet and the environment to claim otherwise.
Peter C Whitaker 
You need to correct this part;- “ Earth is 4.543 billion years old, which is only 28 billion years younger than the Milky Way solar system itself.”
The Milky Way is a galaxy (our galaxy) not a solar system. And the entire universe is only about 13.8 billion years old which means the universe is about 9.5 billion years older than the Earth.
On your wider point you are correct that the planet and the environment are not the same thing and in everyday speech people do sometimes confuse the two. However, both can be impacted and changed by human activity, (the environment more easily than the planet itself).
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