Radicha Widyaningtyas

Global warming is the increase in the average temperature of the Earth’s near-surface air and oceans since the mid-20th century and its projected continuation. The causes of the recent warming are an active field of research. The scientific consensus is that the increase in atmospheric greenhouse gases due to human activity caused most of the warming observed since the start of the industrial era, and the observed warming cannot be satisfactorily explained by natural causes alone. This attribution is clearest for the most recent 50 years, being the period most of the increase in greenhouse gas concentrations took place and for which the most complete measurements exist.

The greenhouse effect was discovered by Joseph Fourier in 1824 and first investigated quantitatively by Svante Arrhenius in 1896. It is the process by which absorption and emission of infrared radiation by atmospheric gases warm a planet’s lower atmosphere and surface. Existence of the greenhouse effect as such is not disputed. The question is instead how the strength of the greenhouse effect changes when human activity increases the atmospheric concentrations of particular greenhouse gases. Naturally occurring greenhouse gases have a mean warming effect of about 33 °C (59 °F), without which Earth would be uninhabitable. On Earth the major greenhouse gases are water vapor, which causes about 36–70 percent of the greenhouse effect (not including clouds); carbon dioxide (CO2), which causes 9–26 percent; methane (CH4), which causes 4–9 percent; and ozone, which causes 3–7 percent.

source : classge.wordpress.com/.../explanation-text/

my comment ; the greenhouse effect we should immediately press the action wise. because the more severe the situation will harm living things on earth.
other than the state of earth will be more heat, much makhuk also threatened with death because they do not stand a drastic change in natural conditions.

School uniforms are dress codes that are determined by the teaching institutions and students has to follow the designed code obediently everyday. Many people believe that school uniforms should be applied but the others don't.
Uniforms have various advantages for both the family and the child. A united school apparel can relief a financial stress of the backs of many families. As kids tend to compete and imitate each other, the race of following new trends in fashion or, providing different attire for every school day is considered a financial burden, not every family can afford it.
Additionally, a uniform creates a sense of equality between all pupils. Young kids tend to judge others according to their look and what they wear. Uniting their school attire will draw their attention to other criteria and, the only advantage of one student over another would be personality, academic achievement or being good at sports.
On the other hand, as repetition can lead to boredom, children can get frustrated of wearing same thing to school every day. Also, prevent their first steps of individuality by taking away their right to choose what to wear on their own free well.
In conclusion, I believe uniforms aren’t meant to suppress the creativity or freedom of children. It helps redirecting kids’ creativity towards more important things than outer look, and waive financial burden of their families.

Note: This example of discussion text about the pros and cons of school uniform is adapted from http://www.english-test.net/forum/ftopic40618.html

my comment :
I think uniforms are not too important. although it was used for the identity of the school but will more importantly how these students perform and behave well in school and community.
there was no difference in class if all the citizens of the school have a high sense of belonging.