About: http://webisa.webdatacommons.org/363243146

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Taking into account such factors as number of flights per day, fuel consumption, and altitudes flown, they conclude that by 2050, average contrail coverage over Europe will be four times higher than at present, or about 4.6 percent.
http://www.w3.org/ns/prov#wasQuotedFrom	sciencedaily.com