Member Comments

  • Reply to: climate change(summary 3)   2 years 10 months ago

    The article you chose and your summary are very interesting, you did a nice work. There a many reasons on why Climate Change is always increasing, that our planet is warmer. It is interesting when you are saying that some of the studies predict that the planet will be warmer by 4 degrees by the end of the century, which is monstruous. It is sad because all problems have their solution, but in this case, it is maybe to late for help. The Earth is sick and the situation never improves. Climate Change has too much bad consequences. Melting of the glaciers, the large number of carbon dioxide present in the atmoshere, the death of many animals and humans, etc. Human activities take too much place on this planet, it mostly because of it that the Global Warming is present and that it affects a lot around it. I hope that with all the solutions that can be make (eating vegetarian, buy used clothes, take shorter showers, etc.) one day it will be better. But it can't change if not everybody on this planet is giving, learning and changing for the good cause.

  • Reply to: climate change   2 years 10 months ago

    I chose this summary because it is unusual to see such a perspective on climate change.
    We don’t usually associate climate change with the production of food, which is an interesting aspect when you come to think about it. It’s a totally different point of view from what we usually hear which is mostly about the quality of air and pollution. It’s astonishing knowing that countries who are already suffering from such food depletion will have even more trouble in the near future. According to the article that I’ve read “Climate Impacts on Agriculture and Food Supply”, it states that “climate change can disrupt food availability, reduce access to food as well as affect food quality”(EPA) which are distinguishing factors that are severely impacted by extreme weathers. Developing countries are the most at risk due to the fact that they don’t have the resources or equipment needed to manage crops that are supposed to sustain their villages. Everything becomes interrelated when it comes to food since it is a disturbance that occurs globally because of the import-exports that happen between continents.


  • Reply to: Ocean Management   2 years 10 months ago

    I chose to comment on this summary since I find this issue affects me on a more personal level. Growing up, I used to live in Israel and the beach was 15 min away from our house. We used to take walk by the ocean every other day. And once in the ocean there is the biggest verity of fishes. I loved it! However, knowing that today, each year, there is around “8 million tons of plastic enter the oceans” is horrifying. Considering it involves not only the fish we are consuming but also the rest of the ocean. We must make sure to lower the percentage of plastic in the ocean by at least 20%.

    University of British Columbia. (2016, September 7). Future fisheries can expect $10 billion revenue loss due to climate change. ScienceDaily. Retrieved April 23, 2018 from

  • Reply to: Oceans and Fisheries and the effect of climate change   2 years 10 months ago

    I chose to comment on your summary because I am very sensitive to climate change causing so many damages to the oceans and the fisheries. Fisheries are affected by ocean acidification, plastic and toxic pollution, overfishing. Climate change affects all of us, as occupants of the planet Earth. Flooding and storms show us just exactly how much weather and climate can affect our lives. We have nowhere to go for now and we have no choice than to preserve what we still have in order to survive. There is a reason to believe that some unknown amount of warming could cause a catastrophic release of methane currently locked in methane clathrates on the ocean bottom, greatly accelerating warming. The Oceans are slowly dying which in itself is a life ending event. Scientists have recently calculated that global warming has a significant probability of causing the mass extinction of the phytoplankton in the ocean that provides about 70% of the oxygen on earth. If this happens, it will lead to the extinction of all animal life on Earth, including humans. I am outraged that state fisheries management of basic human pollution of marine inshore habitat and loss of this habitat has been ignored in order to protect special fisheries interests. General overfishing of depleted fish stocks and shrimping bycatch are blatant abuses happening on fisheries.

  • Reply to: How to Prevent Overpopulation   2 years 10 months ago

    I chose this article because of the rich detailing of the concerning issue. One piece of information that never accrued to me, is that our pollution will increase by a minimum of 6 billion by the end of this century. Estimating the fact that our resources are coming to an end, additionally, we will face issue that will slow the productivity of our resources. This may be the recipe to a disaster. Moreover, “Emissions, climate change, unemployment and regional instability due to resource insecurity are also consequences of population growth.” These aspects are the main issue seen in any subject cover at Planetary Challenge course. We must take seriously the sign given to us and start taking action where we can. For example, around 150 million Americans use nonrenewable ground water everyday (Population Growth Puts Dent in Natural Resources, 2008), instead of using filtering water, or uncleansed water in our bathroom.

    Washington University in St. Louis. (2008, October 10). Population Growth Puts Dent in Natural Resources. ScienceDaily. Retrieved February 23, 2018 from

  • Reply to: Consequences on ecosystems   2 years 10 months ago

    I found Simon-Karl’s summary very interesting, due to the fact that he is touching the main points of the ecosystem changes and their affect. When the author mentions that the climate change has negative affects on the food chain of ecosystem, I directly related this content to the article I was readying about. It proves how any catastrophe up coming in our century is bringing a chain of other issues with it. As for example, cutting down the Acacia tress, will affect ants that are living in it, considering that the ants have a big impact on the food chain. (“Even small changes within an ecosystem…”, 2018) Thus, the food chain may be directly related to our population in the long-term. Once again, climate change is a part of that issue chain. “It happens when an ecosystem can’t bounce back from a stressor. For example, great drought may evaporate all the water and it will not return afterwards.” Those are high point that the population should be focusing on.

    Binghamton University. (2018, February 1). Even small changes within an ecosystem can have detrimental effects: Interactions between small organisms are 'keystone' interactions that scale up to shape whole ecosystems. ScienceDaily. Retrieved March 15, 2018 from

  • Reply to: Climate Change   2 years 10 months ago

    Due to the summary I chose, the author mention that “the last 3 years have been the warmest years on record for the globe.” However, I would have to argue against it, since many researches have proved how climate been unstable through the existence of the planet earth. And around the year 12 000 B.C. that the climate has stabilized and the development of the human kind had begun. In other words, they were major climate changes in the past centuries, to be exact a change of 2°C higher (“Climate change could raise food insecurity risk”, 2018) Yet, we must consider he whole history when mentioned the record of the globe. Overall, the content was really interesting, and was supporting the fact that climate change is bringing heavy changes to the future generation.

    University of Exeter. (2018, April 2). Climate change could raise food insecurity risk. ScienceDaily. Retrieved April 5, 2018 from

  • Reply to: Shark overfishing   2 years 10 months ago

    Interesting summary, good job! I decided to comment this summary because this issue affects me particularly. Most of people are afraid of sharks because of the danger the represents. But they are not more dangerous than other species. It makes me very sad because a lot of them are killed for many reasons and are becoming endangered. I find interesting the part when you said that approximately 100 millions of sharks are fished each year, it is monstrous. And when we think of the time the make to reproduce themselves, it is even more monstrous. Sharks are fished all around the globe. I found an interesting map that shows where sharks are mostly fished around the world. It is fascinating because with it, we can see where most of fishermen should stopped for improving the situation and help the sharks to live longer.

  • Reply to: Ecosystems change   2 years 10 months ago

    When reading your summary, the statement that human beings play a major role in negative impacts of worldwide ecosystems captured my interest, due to the over exploitation of wildlife and natural vegetation as you have mentioned, which creates a direct conflict between the humans and the ecosystems that I totally agree on being an important issue linked with us as human beings. There are in fact many factors to animal extinctions, but it is accurate to say that most of those factors are associated with human actions upon our own ecosystems such as pollution, abuse of resources the industry and many others. As for the fact that only creatures domesticated by humans will thrive in the future, I understand the claim, but we never know exactly how our ecosystems will develop to be in the future and which specific species will thrive. Also, I agree with the fact that our ecosystems are very fragile and vulnerable and the impacts of global warming on the future of our planet are an important issue.

  • Reply to: Climate Change Cause and Effect   2 years 10 months ago

    After reading the summary, I decide to respond to it due to the worldwide problematic of climate change described by global warming and the occurrence of natural disasters, which is interesting to me since the issue has become larger over the years as we realized that solutions should be implemented and the case should be taken in consideration and also studied through the causes the consequences, as you have mentioned. I agree that in 50 years, the annual amount of carbon dioxide that was released in the air has increased importantly, having direct impacts on the globe's climate such as an increase in water retention within the atmosphere, which gives us a hint on one major cause of the issue. It is right that governments spend a lot of money on repairing the natural disaster's damages and so in my opinion, a lot of money should also be invested in the solutions and preventing the future dangers of global warming and global emissions, although it would not happen as fast as we imagine. In order to make an effective change with this issue, every individual should be aware of the impacts of pollution (which is also a big cause of climate change) and should adhere to reduce their pollution habits that slowly stack up and speeds up the climate change. Also, the reference of wealth being the mood to the planet's personality is totally accurate and well thought.