Was the environment always same as it is now?

Question

from evolution

Answer 1

NO. Study your history and science books more. This planet has gone through an Ice age and tropical period and has even been barren at one point.

Answer 2

The Earth has undergone several types of change that have modified the environment considerably during its 4.5 billion year existence. When it first formed, it was molten (hot, melted rock) and cooled slowly with heavier elements (like iron) sinking into the core.
Originally there wasn't much oxygen in the atmosphere. Life began as blue-green algae about 3.8 billion years ago. The algae were photosynthesizers, which means they converted CO2 and sunlight into energy, giving off oxygen as a byproduct. Over millions of years, their waste gas (=oxygen) replaced whatever atmosphere existed before and created a whole new way of life.
Another aspect of planetary evolution includes plate tectonics, or the movements of large landmasses. About 250 million years ago there was a supercontinent called Pangaea when all the land in the world formed one giant landmass. The area in the center of that landmass was very far from any ocean, so the environment there was very dry. Pangaea broke into 2 big parts (Laurasia & Gondwana) and those parts broke into smaller parts that are still moving around (in the form of the continents we know today). India, for example, was an island that bumped into Asia. The pressure of the collision is still raising the Himalaya Mountains higher every year. The Sahara Desert used to be a lush forest area; Antarctica (south pole) was a jungle.
There have been many ice ages when ice has covered large parts of the world. Europe experienced a "Little Ice Age" between 1450 & 1850. The Takliman Desert in China and the Sahara are both getting larger now, so change continues right up to the present day.

Answer 3

no the enviroment was more clear,safe,unpolluted and less carbon dioxide. and less endangered species.the carbon content is not increase as much as today in past 2million years.so my advice to every one is reduce reuse refuse and recycle

Answer 4

are you crazy or something????????????