¶ … preferences by countries can led to different forms of the challenges that they face and the strategies they choose to address these challenges. However, in an increasingly globalized world, many modern challenges are increasingly affecting the world's population as a whole; like climate change for example. Thus the next generations of challenges will require solutions that involve an unprecedented level of global collaboration. Furthermore, these challenges can be thought of in terms of social, economic, and environmental challenges. This paper will briefly outline three development challenges that are facing development in the 21st century. Climate Change

Climate change, also known as global warming, is an environmental phenomenon that has attracted significant global attention in recent decades. This is arguably an issue that can be thought of as an existential issue. Climate change stands the potential not only to threaten many animal species around the world in a new global masses extinction event, but also has the potential to virtually change the climate system in a way inhospitable to future generations of humans. With the world population recently climbing to over seven billion people, many researchers are questioning the natural ecosystem's ability to support the global population (Hanna & Osborne-Lee, 2011). The global human population might reach a point, if they haven't already, in which ecological systems and the planet's natural systems lose their ability to regenerate.

The response required from the developed countries of the global north, the developing countries of the global south, and the transitional developed countries will all need to contribute differently and many of these contributions are heavily debated. For example, the developed countries have used fossil fuels to growth their modern economies and fuel development. However, fossil fuels are heavily contributing to climate change. If the developing countries develop along the same paths and using the same means, using fossil fuels for development, then many greenhouse gases had no knowledge of the environmental damage that they were causing at the time. The ethical responsibilities needed from countries at different stages of development are far from clear. Bangladesh is particularly at risk in the face of a changing climate. Bangladesh, with its low elevation and severe tropical storms, is among the countries most vulnerable to the effects of climate change, though it has contributed little to the emissions that are driving it (Harris, 2014). Thus, despite contributing very little in terms of greenhouse gases, Bangladesh will be among the countries most effected by the consequences of climate change.

Inequality

Inequality is a problem on many levels throughout the world. Not only is there significant amount of inequality between countries, but there is also many developed countries, such as the U.S., that have significant amounts of inequality within their county itself. Inequality is closely linked to social sustainability. A society needs to ensure that all of its member's basic needs are met in order to maintain a level of social stability. If large parts of the population are oppressed and excluded from prosperity, then social instability is a potential outcome and this can have implications for all parts of society.

There have been attempts to try to incorporate levels of inequality and social sustainability into different metrics that can help track its progress. One model, the 3Ps, tries to encourage a balance between…