Functions:

The function represents the cost.
The variable represents the number of dogs walked.
Weather with high pressure is usually drier, so take from that what you can.
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Answer:
There are four major issues affecting the oilsands: declining price outlooks, market access, a reduction in investment and climate change pressures.
Explanation:
The environmental consequences of oil production from Alberta's tar sands are major, beginning with its effect on climate change. North America's transition to oil from the tar sands not only perpetuates, but actually worsens, emissions of greenhouse gas pollution from oil consumption.