Means of Transport CO2 equivalent emissions per passenger km
Short Flight ✈️ 255g
Medium Car (Gasoline) 🚗 192g
Medium Car (Diesel) 🚗 171g
Medium Flight ✈️ 156g
Long Flight ✈️ 150g
Bus 🚌 105g
Medium Motorcycle 🏍 103g
Gasoline Car (Two Passenger) 🚘 96g
Medium Electric Vehicle 🚙 53g
National Rail 🚂 41g
Ferry ⛴ 19g
Eurostar (International Rail) 🚞 6g

Flying on a short flight or driving alone are the most carbon-intensive travel methods. However, adding one more passenger to your car ends up cutting the emissions in half, making driving more efficient.

, it’s worth breaking down categories of flights more, as their emissions depend greatly on their route length:

• Short Flights: For example, domestic flights within a European country, or flights within a U.S. state have the highest individual carbon footprint.
• Medium Flights: For example, international travel within Europe, or between U.S. states, have a significantly lower carbon footprint per person.
• Long Flights: Flights over 3,700 km (2,300 mi), about the distance from Los Angeles to New York, have the lowest carbon footprint per person.
  Why are longer flights far more eco-friendly than short-range flights? It’s because take-off uses much more energy than the ‘cruise’ phase of a flight. For short flights, the efficient cruise phase is relatively short-lived.

The most-watched aircraft on the flight tracking App Flightradar 24 are a Global Hawk unmanned spy plane and USAF KC135 and KC10 tankers.

The unmanned Global Hawk has been flying over the Black Sea just south of Russia’s naval base at Sevastopol while the KC135 (Boeing 707s) and KC10 (DC-10) tankers have been stationed over Romania and Poland.

Over 58,000 people are watching the activities of the Global Hawk which has a call sign of “Forte12” or “Forte11”.

The $170 million aircraft is piloted remotely and operates from Italy.

It has an endurance of about 32 hours and can fly over 22,000km at an altitude of 18,000m.

People have gotten much savvier about computer security in the last decade or so. Most people know that sending a document with sensitive information in it is a no-no, so many people try to redact documents with varying levels of success. A common strategy is to replace text with a black box, but you sometimes see sophisticated users pixelate part of an image or document they want to keep private. If you do this for text, be careful. It is possible to unredact pixelated images through software.