I’m home now in Vancouver, with the daunting task of summing up and integrating a journey that covered four continents and more than eight months of my life. It can leave a person wondering how to bring that much home, or what home even means.

That said, there are a few common themes that became clear over the course of the journey. A major one concerns the views and assumptions that tend to guide the actions of our culture with the rest of the world, the damage of which becomes obvious when viewing there effects on some of the most impoverished nations on Earth.

In the case of Rwanda, we have been told that there horrific genocide was the culmination of tribal conflicts that stretched back centuries. After a mere days in that country, the truth became quickly and overwhelmingly obvious – that the division between Hutus and Tutsis was a colonial weapon established by the Belgians, and exploited by the French, in order to gain greater control over the population and later to profit by selling the weapons of genocide.

In rapidly developing India, they are celebrating their initiation into the world's nuclear fraternity, while domestically, the moral stance of the Dalai Lama has been criticized and questioned on the grounds that it may threaten Sino-Indian relations. One of the world's greatest ironies may explain India's true motivation. In 1999 , Major William Corson, intelligence aide to US President Dwight David Eisenhower, alledged that India agreed to grant the the Dalai Lama asylum in exchange for US help in developing nuclear weapons.

The case is similar in the issue of global warming, where western governments, in particular the US, points the finger of blame at developing countries while it is responsible for maintaining the worst mileage standards, consumes the most beef (one of the largest greenhouse gas contributors), and uses the most crude oil while they continue to propogate a war over oil to maintain the status quo.

That word, responsibility, is the key. Western morality is anchored on a bastardization of Adam Smith that assumes ultimate good will magically prevail for all by pursuing our own individual interests. However, unless balanced by an equal sense of our personal responsibility, what we perceive as our rights quickly turns into indulgence, and there begins most of the world’s problems.

An embrace of responsibility, alongside of our personal rights, makes it obvious that while we have a right to trade and deal diplomatically with African nations like Rwanda, we equally have a responsibility for the outcome of that trade when we market in weapons of destruction to an oppressive regime. It makes it obvious that the moral rights of an entire people are not appropriate negotiating items in diplomacy and trade. It also becomes obvious that the country responsible for the most environmental damage needs to take the lead in forming environmental solutions.

If we strike another person, that blow is not the fault of the person receiving it. A gun owner is responsible for their weapon falling into the hands of young children. Unintentional murder is deemed involuntary manslaughter and is not the responsibility of the murdered. Likewise, the direct harm caused by our consumer, policy, and business decisions is not the fault of our trade partners, but the responsibility of those perpetrating the actions - exploitative businesses, the government’s that those businesses lobby for profitable trade policies, and we, the citizens, who value what we call prosperity over the human rights of other nations affected. The solutions, then, rest with us.

Responsibility can begin at home. The United States, Canada and my own city of Vancouver have a lot of work to do this fall. It’s time to get to it.

A pair of recent stories are pointing to the growing and increasingly human impacts of global warming.

First in the high Arctic, scientists are reporting that some species of plants and animals have begun their annual cycles as much as 30 days earlier in just the past ten years.

In some cases, flowers are emerging from buds and chicks are hatching a full 30 days sooner than they did in the mid-1990s in response to sharply increased temperatures burning off the winter's snow layer.

But while arctic song birds see the light of day a month earlier, climate change is also being implicated as a major factor in Darfur, Sudan where 200,000 have died in an ongoing ethnic conflict. The link was drawn by U.N. Secretary-General Ban Ki-moon said in an editorial published Saturday.

It would be natural to view these as distinct developments. In fact, they are linked. Almost invariably, we discuss Darfur in a convenient military and political shorthand -- an ethnic conflict pitting Arab militias against black rebels and farmers. Look to its roots, though, and you discover a more complex dynamic. Amid the diverse social and political causes, the Darfur conflict began as an ecological crisis, arising at least in part from climate change.

The connection between ecological strain and war was convincingly presented in Jared Diamond's chronicle of the Rwandan genocide featured in his acclaimed book Collapse. The key point in the issue is that as we enter an age of increasing shortages of food and water, warfare and genocide will act as the face mask worn by a true root cause of human generated climate change.

The Wildlife Conservation Society (WCS) has reportedly been stunned by the discovery of what could be "the largest migration of land mammals on Earth". Over 1.3 million animals including white-eared kob, African antelope, mongalla gazelle, elephants, buffalo and ostriches have been counted in an aerial survey of the southern Sudan where it was assumed that wide spread war had wiped out these herds.

This is great news for wildlife. It is not good news for WCS.

I don't usually play the cynic, but this the worst PR job I've seen in the enviro community since the Center for Biological Diversity sued one of North America's largest wind farms for bird deaths caused by turbines. Rather than assuming all animals had perished when a proper survey had not been completed since 1982, it may have been better to take a conservative approach in estimating the death toll.

The WCS is accepting donations to help them "protect this wildlife haven". Although I don't know much about the organization, my advice would be that if the WCS couldn't locate the world's largest migration of animals in the first place, they're probably the wrong folks to be protecting them.

Check out the BBC slide show for more great pics.