Numbers on Windenergy

Source: EWEA (European Wind Energy Association)

Comparative noise for common activities

Source/activity	Indicative noise level (dB)
Threshold of hearing	0
Rural night-time background	20-40
Quiet bedroom	35
Wind farm at 350m	35-45
Busy road at 5km	35-45
Car at 65km/h at 100m	55
Busy general office	60
Conversation	60
Truck at 50km/h at 100m	65
City traffic	90
Pneumatic drill at 7m	95
Jet aircraft at 250m	105
Threshold of pain	140

Source: CIEMAT

Statistic on the causes of bird mortality

Causes of bird mortality	Annual bird mortality estimate
Buildings/windows	550 million
High tension lines	130 million
cats	100 million
Vehicles	80 million
Pesticides	67 million
Communication Towers	4,5 million
Wind turbines	28,5 thousand
Aeroplanes	25 thousand

Source: Ericksonn W., Johnson, G. and Young, D. (2005)