Solar cars

Solar cars transfer solar energy to electricity, which are environmental friendly. Moreover, solar energy is a kind of renewable energy, it can reduce greenhouse gas emission and need lower cost.

However, despite it has several advantages, some shortcomings exist as well. Transfer efficiency between solar and electricity is one of the main problems. Due to instability of solar energy, it is difficult to gather solar energy so that cost is high, therefore, it cannot be widely used.

In addition to characteristic of solar energy, solar cars use aerospace materials which are very expensive, technology and application of materials cannot meet the demand of enough power, also solar cars have low weight capacity and low speed. These drawbacks would be barriers to popularize solar cars. However, people should research this kind of vehicle because solar energy is clean and sustainable, it is helpful for some suburb where there are no electricity. Pictures below show solar cars, they are still be researched, hope one day, I can drive this kind of car.

Sustainable packaging

Green package materials include reuse, recycle, edible, degradable and natural materials. This kind of package use less materials, product less wastes and save energy, also they are easily reuse and recycle, therefore, this package can meet the demand of no pollution and no harm. Even though, natural materials have no harm, they need significant amount of investment. However, composite materials need lower cost, so that it better to choice this kind of material.

In Switzerland, sustainable packaging is famous. They think ecology is the home of human beings and other lives so that they follow the rule of “ecology first” to produce and transport. All packages use green materials to produce papers so that no trees would be cut. Most package use plant fiber which can resolve in nature and without adhesion agent, all package use papers’ interaction force. In package, there are no inks. Besides, it produces less green house gases.

However, though sustainable packaging plays an active role in sustainable environment, it needs high technology as well. Nowadays, it has not been developed but need more attention because it can minimize usage of plastic and greenhouse gas emission, thus, government and relevant organizations and researchers should make deep research about green packaging materials.

Dog parks

In china, most people have some problems to choice a suitable place to walk the dog because walking the dog not only have adverse effects on public environment, but also have accidents when walking dogs such as scaring those who dislike dogs, therefore, dogs will be driven away in some public places such as streets and parks. Especially in Shenzhen, a city in China, every park forbidding dogs to enter into from 2013, so it is urgent to build a place for residents to walk the dog. 

Dog parks provide places to walk the dog. In dog parks, there are special design to establish comfortable environment for dogs to play and train, several activities aimed to meet the demands of dogs are created as well.

Dog parks have beneficial for those who like dogs and dog owners. However, there are still some problems. Firstly, when too many dogs in these parks, how to ensure comfortable and harmonious environment because there are too many dog shit. I think maybe it can create a special space for dogs and employ special people to clean dog shit so that public environment is good.

Overall, dog parks are special and important for both dogs and people