Man made

Big, big evidence of the influence of mankind on nature are these large wind turbines. Close to the two on the main are the two smaller ones on the extra. These were built first and then obviously the financial (and environmental) benefits were sufficient to build the larger ones. Visible from far away and probably (a bit) annoying for animals. But less polluting (short and long term) than other sources of energy.
The extra shows what happens with a wide lens and standing too close to the object. No worries, both columns are really vertical :).
Thanks to BobsBlips for hosting.