2nd Pd English
Space Exploration is an interesting part of today’s society. There are kids across the world with lifelong dreams of becoming an astronaut. Although many may think space exploration is a great thing and we should keep progressing in it, space exploration is a waste of time because of the medical effects to crew members, the countless money we spend on it, the environmental effects, and the dangers of the unknown universe.
The medical effects space exploration has on crew members in space are endless. First the crew members’ prolonged exposure to reduced gravity environments can cause bone loss, increased loss of bone materials, increased chances …show more content…
At the beginning of the 21st century, the transition reached a stage where fossil fuels, notably petroleum, are dominant. Out of the world’s total power production, 87.1% is derived from fossil fuels. How our activity leads to climate change. When we extract and burn fossil fuels such as coal or petroleum, we cause the release of carbon dioxide (CO2) and other heattrapping "greenhouse gases" into the atmosphere. Though natural amounts of CO2 have varied from 180 to 300 parts per million (ppm), today's CO2 levels are around 400 ppm. That's
30% more than the highest natural levels over the past 800,000 years. We also can tell that the additional CO2 in the atmosphere comes mainly from coal and oil because the chemical composition of the CO2 contains a unique fingerprint (Environmental Defense Fund). Air transportation plays an integral part in the globalization of transportation networks. The aviation industry accounts for 8% of the energy consumed by transportation. Air transport has high energy consumption levels, linked to high speeds. Fuel is the second most important cost for the air transport industry accounting for 1320% of total expenses. This accounts for about
1.2 million barrels per day. Technological innovations, such as more efficient engines and better aerodynamics, have led to a continuous improvement of the energy efficiency of each new generation of aircrafts. While ship and truck engines are adaptations of