Fix the grammar mistakes: While there exists a problem that the burning of gas gives off poisonous gas and large amount of carbon dioxide which cause serious air pollution.
The burning of the gas causes the burning of the gas.
The burning of the gas causes the burning of the gas.
The burning of the gas causes the burning of the gas.
The burning of the gas causes the burning of the gas.
The burning of the gas causes the burning of the gas.
The burning of the gas causes the burning of the gas.
The burning of the gas causes the burning of the gas.
The burning of the gas causes the burning of
The burning of fossil fuels causes the air to become toxic and poisonous.
The burning of fossil fuels causes the air to become toxic and poisonous.
The burning of fossil fuels causes the air to become toxic and poisonous.
The burning of fossil fuels causes the air to become toxic and poisonous.
The burning of fossil fuels causes the air to become toxic and poisonous.
The burning of fossil fuels causes the air to become toxic and poisonous.
The burning of fossil fuels causes the air to become