Well we have, wifi radio and cell phone signals bouncing around the earth, all day every day. and no one seams to mind at all. All tesla's invention did was tap into the earths actual energy flow and utilize it for power.
Marconi didnt invent the radio as he is given credit in the US, it was tesla.
Also tesla's AC (alternating current) only operates (exists) at the frequency in which people cannot hear, so if you are worried about dogs going a little crazy sometimes or a couple birds forgetting where their nest is then yeah.
But don't forget that the US has one of tesla's inventions employed in HARRP, so lets weigh up the reasons we don't have wireless energy even though its existed for over 5000 years (egyptians/sumerians) is because it costs money, and makes jobs and industry for employees, if we went 100% free energy 'they' would no longer have any use for the 'useless eater' or the average joe worker...