Oftentimes it is "removing barriers to trade" that motivates countries to join regional trade blocs, since members of such "blocks" have completely free trade with one another.
Sustainability is the ability of a biological system to sustain itself indefinitely to remain indefinite and productive, in an ecological sense. Conservation and Stewardship of our natural resources relate to this, as it is the impact of human development, industry, and consumption that is putting a strain on our environment and its natural ability to sustain its systems. With careful approaches to the environment, we can minimize our negative impact on the Earth and support the ecosystem to be sustainable through conserving the landscape and taking care of the natural resources available to us.
a) a person cannot commit slander or libel.
This is when time started and earth was created