Status of "contamination" by engines (approximattely):
year 1895 : 120 thousand
year 1986 : 0.5 bilion
year 2000 : 1.0 bilion
year 2015 : 1,2 bilion
... machine. What is it?
Anything what contain combustion engine, clocks, toys of many different types and sizes, electric motors, computers, robots, robotized manufactures, etc, etc... Those items got something common: It is possible to switch them on/off and they are cooperatable by human race.
Funny here is the "word". Machine is something what human race created and then started to race (run, use, switched on, keep on running, keep on cuting, killing, etc, etc...).
But!: If you loOk a little bit closer and when you will teach yourselves from history then you will find how human race primarily thanks to combustion engines destroyed our only home that we called The Earth.
Technology itself is something based on strict rules. Those rules are with technology from beggining to its destruction. To explain text above: When you start to create "a new technology" than you are probably working for military department inside of strictly controled environment by exact rules and orders. If you brake those rules or orders than you will get probably into jail. But after few years when "a new TOP SECRET technology" will get into civilian market then all those "users" will get only manuals and most of them will even not read them.
And even if those untrained "users" will read those manuals then it is not enough.
But The Earth was evolving for bilions of years without humans heavy technology. Life on The Earth is evolved system by itself. And when human race put inside of this delicious and perfect system something what act as "huge razor blades powered by fire and electric" (instead of life powered by water) then very fragile balance was completely disturbed.
Instead of using machines to easily maintain planetary balance because of overpopulation, human race keeps up destruction of that balance.
The Earth. The most delicious and perfect system known by human race. But approximately about 400 years back humans became overpopulated and thank to technology started to extract ALL sources in the global scale.