Most kids would agree: Sucking a lungful of helium out of a balloon makes your voice sound hilarious. But contrary to popular belief, the switch from air to helium gas doesn’t actually increase the pitch of your voice (at least not very much).

Breathing in pure helium can cause death by asphyxiation in just minutes. Inhaling helium from a pressurized tank can also cause a gas or air embolism, which is a bubble that becomes trapped in a blood vessel, blocking it. The blood vessels can rupture and hemorrhage.

Why is SF6 not banned yet? In 2014, the European Commission tried to ban SF6 (in the framework of its F-Gas Regulation No. 517/2014), but it did not affect its use in the electrical industry. The reason for this was that, at the time, there were no commercially viable SF6-free alternatives to the existing switchgear.

Is Sulfur Hexafluoride Safe to Breathe? Yes and no. SF6 is a non-toxic gas so it does not harm the lungs of someone who breathes it but it does displace oxygen.

carbon dioxide

CO₂

While diesel engines emit LESS CO2 than their petrol equivalent, they emit MORE NOx. The very things that make diesel engines produce less CO2; high combustion temperatures and lean burning, in turn produce higher levels of NOx. More diesel engines brought down CO2 emissions significantly, but increased NOx levels.

Methane

In fact, carbon dioxide, which is blamed for climate warming, has only a volume share of 0.04 percent in the atmosphere. And of these 0.04 percent CO2, 95 percent come from natural sources, such as volcanoes or decomposition processes in nature. The human CO2 content in the air is thus only 0.0016 percent.

While sulfur dioxide isn’t a direct greenhouse gas like carbon dioxide or methane, it is considered an indirect greenhouse gas. Sulfur dioxide is regarded as an indirect greenhouse gas because, when coupled with elemental carbon, it forms aerosols.

The main greenhouse gases are:

• Water vapor.
• Carbon dioxide.
• Methane.
• Ozone.
• Nitrous oxide.
• Chlorofluorocarbons.

Yes, ammonia fits that description, but it is not long-lived in the atmosphere and it is not widespread. So, even though ammonia is a good infrared absorber, it is not an important greenhouse gas.

Ammonia emissions have been shown to be climate sensitive (Sutton et al., 2013) with a global emissions increasing about 42% for a warming of 5 °C. This means, that the expected global warming is counteracting the efforts to reduce agriculturally emitted NH3.

Reforestation is the activity among these four options that does not contribute to global warming. It is the act of planting more trees and restoring the forest and woodlands. It mitigates global warming by enhancing biological process thru reduction carbon dioxide, a greenhouse gas that affects global warming.

Ten Signs of Global Warming

• Arctic sea ice extent is diminishing.
• Ocean heat content is increasing.
• Air temperature over ocean is increasing.
• Sea surface temperature is increasing.
• Global sea level is rising.
• Humidity is increasing.
• Temperature of the lower atmosphere is increasing.
• Air temperature over land is increasing.

Scientists agree that global warming is caused mainly by human activity. Specifically, the evidence shows that certain heat-trapping gases, such as carbon dioxide, are warming the world—and that we release those gases when we burn fossil fuels like coal, oil, and gas.

Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.

Human-mediated causes of biodiversity loss Land-use change: Humans may destroy natural landscapes as they mine resources and urbanize areas. Some examples include the mining of natural resources like coal, the hunting and fishing of animals for food, and the clearing of forests for urbanization and wood use.

Human activity is by far the biggest cause of habitat loss. The loss of wetlands, plains, lakes, and other natural environments all destroy or degrade habitat, as do other human activities such as introducing invasive species, polluting, trading in wildlife, and engaging in wars.

Humans affect the environment in positive and negative ways. Cutting down trees and littering have a negative effect on animals and plants. Protecting endangered species and cleaning lakes and seas has a positive effect on the environment.

Reduce Stress. Studies show that people who spend time cultivating plants have less stress in their lives. Plants soothe human beings and provide a positive way for people to channel their stress into nurturing.

Ten Simple Things You Can Do to Help Protect the Earth

1. Reduce, reuse, and recycle. Cut down on what you throw away.
2. Volunteer. Volunteer for cleanups in your community.
3. Educate.
4. Conserve water.
5. Choose sustainable.
6. Shop wisely.
7. Use long-lasting light bulbs.
8. Plant a tree.

The main interactions between humans and our environment can be grouped into the use of resources and the production of wastes. Humans are extracting increasing quantities of natural resources from the Earth which is causing problems of over-exploitation, for example through overfishing and deforestation.