Based on the number of cars sold and the price, ratings and reviews by users, some of the most popular luxury sedan cars are Mercedes-Benz C-Class, BMW 3 Series, Lexus ES, Mercedes-Benz E / CLS-Class, Infiniti Q50, BMW 5 Series, BMW 4 series , Audi A4, Acura TLX V6, and Lincoln MKZ Grey.

The moment it exits the dealer, a car's resale value can go down by 30% or more. Cars depreciate very fast. Considering this, it's hard to define them as 'investments' in the traditional sense. But this is not always the case for all luxury vehicles. When a car model reaches collectible status, its value can hold for a long time.

With around a billion cars on the planet, the pollution produced by vehicles is a serious—and still growing—problem. The carbon dioxide released when fuels are burned is also a major cause of global warming. The solution could be electric cars that get their energy from cleaner sources of power or hybrid cars that use a combination of ele