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Human beings are not isolated individuals. We cannot live alone. We need other people in order to become part of society.

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In order to become really human, we need other people to coexist. So we say that human beings are interdependent.

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We also need basic resources to survive. For example, we need clean air, fresh water, food, or energy.

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So we also depend on the ecosystem we live in. We are ecodependent. As we are ecodependent and interdependent,

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we must take this into account because our activity affects the planet we live in.

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Unfortunately, in the last two centuries, human activity has changed the way planet Earth works.

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The Industrial Revolution has changed the way we live on planet Earth.

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We have released massive amounts of CO2 and other greenhouse effect gases to the atmosphere,

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and this has changed the climate and this has created a global warming problem

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that might affect biodiversity and even human survival in the future.

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Only if we take care of our planet, human beings will be able to survive.

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Of course, non-renewable resources such as oil or minerals cannot be extracted forever. There is a limit for them.

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But also, renewable resources have a limit. We cannot use water or air without limit

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because in a country populated by 8 billion people, there is a limit to the amount of fresh water or clean air that we can use.

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So that's why we say the carrying capacity of planet Earth is being excessed.

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The carrying capacity of an ecosystem is the amount of a certain population that can be sustained with the resources that are available.

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In this sense, we talk about the ecological footprint.

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The ecological footprint is a calculation of how many planets Earth would be necessary

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if everybody lived with the same patterns, with the same type of life, with the same style that we are currently having.

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If everybody lived like now we are living on planet Earth, we would need 1.7 planets Earth to keep on living like that.

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Of course, as we don't have 1.7 planets Earth, we only have one, we must do something if we want to keep surviving here.

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We must limit the amount of resources we use. We must change our way of life.

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We must stop consumpting so many goods that we sometimes don't really need.

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We should be careful in the way we use renewable resources.

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And we should use moderately the non-renewable resources because there is a limit and they are getting exhausted.

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Only like that, taking an environmental conscience and changing the way of life, can we survive on planet Earth and can we assure a future to our descendants.