Bt-corn, a Genetically Modified Organism (GMO), is produced to make corn toxic to European corn borer larvae. More broadly, genetic modification produces crops with increased nutritional value and further health benefits that boost quality of life across the world. However, some express concern about unknown health effects of GMOs, as well as potential biodiversity loss their growth prompts. When a specific type of crop (e.g., bt-corn) displaces other strains, different varieties of that crop grow rarer. How should the immediate benefits of GMOs be weighed against future risks posed by a loss of biodiversity?

Xi does not eat meat because of its link to the suffering and death of animals. But she isn't sure if she can still wear animal products, like wool and leather, ethically. What if they are second-hand? What if they are environmentally responsible than their alternatives?

If current population trends are unsustainable, what does this mean for our individual procreative choices? Do we have a moral duty to limit how many children we have to address overpopulation?

Millions of tons of electronics are discarded each year and end up in developing nations, where they hurt the environment. Is it morally permissible for nations to sell potentially hazardous e-waste to willing buyers in developing nations? Do manufacturers have a moral obligation to create products with longer lifespans, even if they would earn less money as a result? How should manufacturers, governments, and consumers solve this problem?

The countries that emit the most carbon dioxide catalyze climate change while countries that emit the least amount bear its consequences most. Peter Singer proposed that each nation has a right to produce CO2 up to a certain amount and countries that pollute below the limit can sell their emission rights to countries that produce more.