What dose it mean to say that countries of the world are interdependent?

This interdependency between nations has existed since the Age of Exploration, which initiated the trade of goods, such as spices and slaves, between continents. 

Currently, we still trade goods. We are also more connected. Due to the advent of the Internet, we are able to socialize with more people in more places with greater ease. We can also easily access media and cultural products from other countries and learn about the lives of people who...

This interdependency between nations has existed since the Age of Exploration, which initiated the trade of goods, such as spices and slaves, between continents. 

Currently, we still trade goods. We are also more connected. Due to the advent of the Internet, we are able to socialize with more people in more places with greater ease. We can also easily access media and cultural products from other countries and learn about the lives of people who are not like us. 

With trade pacts, economies become more interconnected. When you go to the supermarket, you may notice that you can buy summer fruit in the winter. This is because trade pacts with countries in the southern hemisphere allow for produce, among other goods, to be shipped north in exchange for goods that we produce. Fair trade practices, which are not universal, ensure that everyone, especially low-wage workers, benefit from the exchange of goods and services.

Finally, the perils of climate change have helped us realize that we are very dependent on each other for the maintenance of the planet and the sustainability of resources. The United States and China are the largest polluters on the planet. The release of carbon emissions in these countries can create problems for others. For example, the leaders of the Maldives expect that the islands will soon be under water. Rising water levels are due to melting ice caps in the Arctic. Though the melting of ice caps is a natural phenomenon, they have been disappearing at a far more rapid rate than in the past.

Interdependency can be beneficial. However, when nations do not work together or consider how their actions impact other nations, there can be harm.