How to describe the achievements in scientific and technological social changes

To do this we must first be informed about the events, at least those in this sphere that have happened, happening and speculate that may occur in our environment, the world in which we live, as stated at the outset, be informed it is necessary to describe the contastantes changing world around us.
Now technically to describe the changes you need to apply past and present as it was, was and is and now verbs.