This is a really interesting question because the answer is highly disputed. Obviously Australia doesn't have the economic strength of Europe or the North American Free Trade Agreement, but between the two, it can be measured in different ways, many people would suggest that EU is in fact bigger, but by measure of GDP, the EU is dominated by NAFTA with a per capita GDP of just over $21k in comparison to EU28's which is just over $18k
I would suggest that it is NAFTA at the moment but this answer might be subject to change in the future,
Answer:
Many scholars believe that the collapse of the Indus Valley Civilization was caused by climate change. ... By 1800 BCE, the Indus Valley climate grew cooler and drier, and a tectonic event may have diverted or disrupted river systems, which were the lifelines of the Indus Valley Civilization.
According to me, no animal would be able to survive in a condition where the sunlight is blocked. As the sunlight is blocked, plants will not be able to make their food as they need sunlight for the process of photosynthesis. As the plants will not get enough nutrition due lack of food, they would eventually die. By this, the herbivorous animals which feed on plants, would not get their food . Also, the the carnivorous animals which depend on the herbivorous animals for food, would not be able to satisfy their hunger as the animals they feed on would be weak or maybe even dead.
