Top 10 low emission cars from around the world

With the United Nations warning against increased levels of CO2 in the atmosphere (400 parts per million in 2015), here's a list of 10 'green' cars from around the world.

Vauxhall Ampera: The primarily electric car has a small 1.4-litre petrol engine along with a low-humming electric motor.

Vauxhall Ampera: The primarily electric car has a small 1.4-litre petrol engine along with a low-humming electric motor. The New European Driving Cycle (NEDC) test rates its battery as fuel-free. The second-generation vehicles have a mileage of 85 km/hr (all-electric) and an overall top speed of 100 km/h. (Getty)

Mercedes-Benz C350e: The luxury petrol hybrid sedan has CO2 emissions of 48 g/km and a fuel economy of 101mpg.

Mercedes-Benz C350e: The luxury petrol hybrid sedan has CO2 emissions of 48 g/km, a fuel economy of 101mpg and a maximum speed of 100km/hr. (Getty)

Volvo XC90: The car has diesel, petrol and plug-in petrol versions with CO2 emissions of 149g/km.

Volvo XC90: The car has diesel, petrol and plug-in petrol versions with CO2 emissions of 149g/km and a top speed of 137mph. (Getty)

BMW i3: The urban electric car is BMW's first zero emissions mass-produced vehicle.

BMW i3: The five-door urban electric car is BMW's first zero emissions mass-produced vehicle, thanks to its electric powertrain. It is the most fuel efficient EPA-certified vehicle and has a top speed of 150 km/hr. (Getty)

Ford Fiesta ECOnetic: One of UK's greenest cars is priced at a steep 15,595 UK Pounds.

Ford Fiesta ECOnetic: One of UK's greenest cars is priced at a steep 15,595 UK Pounds. With CO2 emissions of 87g/km, the diesel car also has a green indicator light which signals the most economical time to change gear. (Getty)

Mahindra eVerito: The fully electric micro-car is available in 26 countries.

Mahindra eVerito: The fully electric micro-car is available in 26 countries. With a starting price of USD 14,202, the EV uses a lithium-ion battery and has a top-speed of 86 km/hr. (Getty)

Toyota Prius: The hybrid electric hatchback is among the cleanest vehicles sold in the US on the basis of smog-forming emissions.

Toyota Prius: The hybrid electric hatchback is among the cleanest vehicles sold in the US on the basis of smog-forming emissions. The car has been classified as an Ultra Low Emission Vehicle by the US EPA (CARB). It has CO2 emissions of 89 g/km and a top speed of 112 mph. (Getty)

Honda Civic Hybrid: Equipped with a hybrid electric powertrain, the car has CO2 emissions of 116g/km.

Honda Civic Hybrid: Equipped with a hybrid electric powertrain, the car has CO2 emissions of 116g/km and was the first hybrid automobile to be certified as an Advanced Technology Partial Zero-Emissions Vehicle in the US. (Getty)

Maruti Suzuki Ciaz SHVS: The mid-size sedan, which was launched in 2014, is one of India's most fuel-efficient cars.

Maruti Suzuki Ciaz SHVS: The mid-size sedan, which was launched in 2014, is one of India's most fuel-efficient cars and has a top speed of 160 km/hr. The new mild hybrid variant is powered by a 1.3-litre diesel engine that helps the car achieve 0-100 kmph in 13.2 seconds. (Getty)

Hyundai i20 Blue is one of the cleanest combustion-engined cars on sale.

Hyundai i20 Blue: One of the cleanest combustion-engined cars on sale, the car emits just 84 g/km of carbon. (Getty)