The correct option is: b
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Emissions of CO₂ from fossil fuels make the largest contribution to climate change. About 90 per cent of the world's carbon emissions comes from the burning of fossil fuels – mainly for electricity, heat and transport.
The largest source of greenhouse gas emissions from human activities in the United States is from burning fossil fuels for electricity, heat, and transportation.
The global breakdown for CO2 is similar to that of total greenhouse gases – electricity and heat production dominate, followed by transport, manufacturing, and construction.
Most of the world's greenhouse gas emissions come from a relatively small number of countries. China, the United States, and the nations that make up the European Union are the three largest emitters on an absolute basis. Per capita greenhouse gas emissions are highest in the United States and Russia.
Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy. Fossil fuels like coal and oil contain carbon that plants pulled out of the atmosphere through photosynthesis over many millions of years; we are returning that carbon to the atmosphere in just a few hundred.
As more people remain in a room, CO2 levels increase quickly if there is not enough fresh air coming into the space. High indoor CO2 levels can cause tiredness, headaches and other symptoms. Increasing CO2 levels show you that the space is not well ventilated.
This could occur when exposed to levels above 5,000 ppm for many hours. At even higher levels of CO2 can cause asphyxiation as it replaces oxygen in the blood-exposure to concentrations around 40,000 ppm is immediately dangerous to life and health. CO2 poisoning, however, is very rare.
Fuel burning appliances in the home create more household co2. Homes with the garage attached can also create high levels of co2 in your home. Carbon dioxide is also created every time we breathe!
Although China currently emits the highest levels of CO₂ annually, it has emitted far less than the United States over the past three centuries. Since 1750, the United States has produced more than 430 billion metric tons of cumulative carbon dioxide emissions.
Worldwide emissions of carbon dioxide (CO2) from burning fossil fuels total about 34 billion tonnes (Gt) per year. About 45% of this is from coal, about 35% from oil and about 20% from gas. The impacts of electricity generation go beyond the emission of CO2 and other greenhouse gases.
Human activities—mostly burning of coal and other fossil fuels, but also cement production, deforestation and other landscape changes—emitted roughly 40 billion metric tons of carbon dioxide in 2015.
Sources of CO2 in indoor air
Carbon dioxide is a pollutant found in indoor and outdoor air. Indoors, CO2 is mainly produced through the respiration (breathing) of occupants, but can also come from: cigarette smoking. unvented or poorly vented fuel-burning appliances.
There's a myth that carbon monoxide alarms should be installed lower on the wall because carbon monoxide is heavier than air. In fact, carbon monoxide is slightly lighter than air and diffuses evenly throughout the room.
No. They do not remove carbon dioxide (CO2). Almost all air purifiers are designed to capture some combination of particles and toxic gasses, but CO2 can't be captured by the same filters that capture other gaseous air pollution. Only ventilation removes CO2.
Fossil fuels – coal, oil and gas – are by far the largest contributor to global climate change, accounting for over 75 per cent of global greenhouse gas emissions and nearly 90 per cent of all carbon dioxide emissions. As greenhouse gas emissions blanket the Earth, they trap the sun's heat.
WHAT ARE THE PRIMARY SOURCES OF CO2? There are both natural carbon dioxide (CO2) sources and man-made (anthropogenic) CO2 sources. Natural CO2 sources account for the majority of CO2 released into the atmosphere. Oceans provide the greatest annual amount of CO2 of any natural or anthropogenic source.