The proper use of land and nonrenewable resources is important to the global economy because it is important for economic health in the short term and for sustainability in the long term.
In the short term, we certainly need to use land and nonrenewable resources. We simply do not have the technology to do without things such as fossil fuels. If we were not to use these sorts of resources, we would not have any economy to speak of because our economy depends very much on them.
However, this does not mean that we can use these resources in a profligate way. If we use them without being careful, we start to jeopardize our economic future. If we waste resources, we hasten the day when we no longer have any of them to use. If we do not conserve resources, we also risk damaging the environment in ways that could be very harmful to our economy in the long run. We might, for example, cause the melting of polar ice caps, increasing sea levels and inundating areas that are economically important to us today.
Thus, we need to use land and nonrenewable resources, but we need to do so in a responsible way so we can have both short term and long term prosperity.