![Take a look at this graph: Global air travel increased 8 fold in 4 decades – and it's an accelerating trend. Yes we have a problem | Bits of Science Take a look at this graph: Global air travel increased 8 fold in 4 decades – and it's an accelerating trend. Yes we have a problem | Bits of Science](http://www.bitsofscience.org/wordpress-3.0.1/wordpress/images/2016/02/global-air-travel-increase-graph.png)
Take a look at this graph: Global air travel increased 8 fold in 4 decades – and it's an accelerating trend. Yes we have a problem | Bits of Science
![2018 Traffic Data for U.S Airlines and Foreign Airlines U.S. Flights | Bureau of Transportation Statistics 2018 Traffic Data for U.S Airlines and Foreign Airlines U.S. Flights | Bureau of Transportation Statistics](https://www.bts.dot.gov/sites/bts.dot.gov/files/u1331/Annual%20Air%20Traffic%20Infographic_0.jpg)
2018 Traffic Data for U.S Airlines and Foreign Airlines U.S. Flights | Bureau of Transportation Statistics
![Cost per passenger as a function of the number of flights per year and... | Download Scientific Diagram Cost per passenger as a function of the number of flights per year and... | Download Scientific Diagram](https://www.researchgate.net/profile/Gennaro-Russo-5/publication/265365579/figure/fig3/AS:392190393110533@1470516884379/Cost-per-passenger-as-a-function-of-the-number-of-flights-per-year-and-of-the-program.png)
Cost per passenger as a function of the number of flights per year and... | Download Scientific Diagram
![Take a look at this graph: Global air travel increased 8 fold in 4 decades – and it's an accelerating trend. Yes we have a problem | Bits of Science Take a look at this graph: Global air travel increased 8 fold in 4 decades – and it's an accelerating trend. Yes we have a problem | Bits of Science](http://www.bitsofscience.org/wordpress-3.0.1/wordpress/images/2016/02/decline-price-plane-tickets.jpg)