Millions of years of evolution . . . replicated in an instant!

Space debris or human-made junk in space is increasing at a rapid pace. According to an estimate by the National Aeronautics and Space Administration, US, there are more than 10 crore objects in space, ranging from less than 1 cm to 10 cm.  Did we think of the junk we would create before leaping into the space age?

Why do we need to conserve energy?