Carbon is a chemical element which is present in organic compounds that make us organisms, plants as well as fossil. It is a vital component of the greenhouse gas CO₂, the highest percentage of the global warming gas in the atmosphere.

These Green House Gases (GIIGs) along with other factors are responsible for the most discussed issues affecting the planet, climate change. Climate change has and still releases a huge set of environmental disasters which are fueling the difficulty of survival on the planet. In order to eliminate, reduce and adapt to these risks of survival, individuals, organizations, and countries will have to adopt carbon neutrality measures. The main aim of carbon neutrality is to achieve a net-zero emission either by balancing the emission or absorbing of carbon or quit the production of carbon. However, to really understand carbon neutrality, the carbon cycle should be first understood

The carbon cycle is the transfer of carbon through different media. Carbon has the ability to move in different media in different forms at different rates and tines. These different factors (rate, time, and media) are the phenomena underlying carbon neutrality. For instance, carbon released into the atmosphere by the rapid burning of fossil fills back as rain in the form of carbonate (碳酸盐) and is absorbed by the reservoirs (oceans, surface water, and the earth surface). Even though the exchange of carbon between some of these reservoirs takes a long time, some over 100 years, carbon was absorbed until now. The main problem existing today is that the emissions of CO₂ are too high to be offset by the reservoirs, thereby leaving the offsetting task to us.

The European Union (EU) is taking all measures it can to offset carbon through Emission trading system which helps industries to manage their carbon footprints. Similarly, China, which is responsible for 25% of the world's CO₂ emissions due to its economic and industrial structure is currently decreasing its energy consumption/GDP and CO₂ emission/GDP, while increasing is forest cover and air quality through its 14th Five-Year Plan (2021-2025) carbon neutrality actions.

For hundreds of years, America’s wilderness has been reduced due to growing cities, leaving outdoors lovers like hunters with fewer chances. By around 1900, too much hunting drove America’s deer nearly into extinction (灭绝), less than a half-million deer, from 45 million in 1450.

Law-makers began to make rules to protect deer and keep ecological balance (生态平衡). And it did make a big difference. By 2000, the deer population had come up to 38 million. Those days, millions of deer lived side by side with humans and could freely find enough food resources.

Gradually, the number of deer was increasing too rapidly, which was not good for both the animals and people. City hunting plays an important role in keeping ecological balance, particularly in places where the animals sometimes cause major problems.

“City deer hunting is a management practice used in many cities and suburban areas across the United States,” says Jason Andrews, program manager of the Urban Deer Hunt in Cedar Rapids, Iowa. In the early 2000s, a high number of car accidents were caused by deer. And there was also significant vegetation degradation (植被退化) in many cities. Many possible solutions were researched by the city government. Some suggested hunting deer and other wild animals, but others were against that practice.

In the end, researchers determined that the most effective and sustainable (可持续的) population management solution would be hunting with bows. “City deer hunting is popular in cities that have too many wild deer as well as wooded areas,” says Andrews. “In Cedar Rapids, all parts of the city have right habitats to keep deer population, thus hunting is allowed. I must note that hunting is only allowed on private lands. No parks or any other public grounds can be hunted.”

【小题1】 They create carbon dioxide and shade. They provide shelter to animals and insects. The wood they provide is used for buildings and other products we humans use and need.

Trees are so important that some people have made it their goal to protect them. We can call these people ‌“tree hugger”. It describes people who support the protection of forests. Today, the term ‌“tree hugger” describes a person who is an environmentalist. 【小题2】 For example, someone who wants to save a rare butterfly species or cut greenhouse gases could also be described as a tree hugger.

However, calling someone a ‌“tree hugger” is not always seen as a praise. 【小题3】 ‌“Tree hugger” described someone who was overly concerned about protecting trees, animals and other parts of the natural world.

Some tree huggers do go to extremes to protect trees. Take, for example, an American woman named Julia Lorraine Hill. For 738 days from December 10, 1997 and December 18, 1999, Hill lived in Luna, a Redwood tree in northern California’s Humboldt County. Luna is huge, measuring nearly 61 meters tall and about 12 meters across, which has stood in Humboldt County for more than 1,000 years. 【小题4】 So, Hill did what any extreme tree hugger would—she moved in! As the website explains, Hill’s main goal was ‌“to bring international attention to the importance of protecting and restoring natural resources.” So, we can safely call Hill a tree hugger. 【小题5】