The Polar Bear population is declining and it is expected to continue declining in the future due to climate change. It is said that by 2050, the polar bear population could decline by 1/3. This is all due to the disappearing of arctic sea ice. The arctic sea ice is declining by a rate of 12% per decade since the 1970s. The melting of the ice and the warming of the waters is not a good climate for the polar bears because they are ice dependent. Much of the food they eat is primarily found in the arctic waters. Polar Bears rely on their access to seals as a sources of food and to breed.
Today, the population of polar bears is thought to be 26,000. By 2050, 8,580 Polar Bears will remain if this estimation remains true. That means that from 2018 to 2050 in this 32 year period the total change would be 17,420 polar bears. This means the decay factor is 0.33. Overall, something needs to be done to slow the decline of the polar bear population because right now they are at high rate of extinction. What is happening to polar bears is also happening to other species, so the issue of climate change needs to be addressed.
Uber is the top ride share app in the united states. Over the past few months Uber has been in the news for the effect they have been having on traffic in NYC. The saturation of drivers got to a point where the congestion and traffic was so heavy that Mayor Bill de Blasio put a cap on the growth of Uber drivers, potentially starting a trend in major cities (major markets) across the us. This graph is the exponential growth of drivers for Uber over there starting years.
It is important to notice that this growth is exponential and driven by customer demand. What will happen when the demand increases and Uber legally cannot support it. A lot is yet to be seen and I am interested to see how their growth will continue.
Historically, economic growth has been linked to CO2 emissions. Although countries who obtain differing levels of per capita CO2 emissions can still have similar gross domestic product per capita levels, these differences occur due to the differences in the CO2 intensities of these economies. The article on Our World In Data explains that CO2 intensity measures the amount of CO2 emitted per unit of GDP. There are two key factors which affect the CO2 intensity of an economy; energy efficiency, and carbon efficiency. Both factors simultaneously work together, because as efficiency improves in both energy and carbon usage, the CO2 emitted per unit of energy will fall.
The graph provided in the article shows CO2 intensity from 1990 to 2013 as a linear downward trend. The CO2 intensity rates have been steadily falling since 1990. This can be considered a result of improved energy/technology efficiency, and increased capacity of renewables.
According to the graph, over the 23 year period between 1990 and 2013;
Total Change: -0.12kg
Decay Factor: (0.47kg/0.35kg)=0.74
Percentage change: (1-0.74)=.26= 26% decrease
Source: CO₂ and other Greenhouse Gas Emissions, Our World in Data