Read the excerpt from an essay about animal poaching.

1) Poaching is a particular problem on the African continent because of the exceptional wildlife found there. 2) The illegal poaching of African rhinos increased by 7,700 percent between 2007 and 2013. 3) Researchers also said that law enforcement in the area can be inadequate in the face of thriving illegal markets.

What is the best transition the writer can add to the beginning of the second sentence to improve the link between ideas?

for example
furthermore
in conclusion
with this in mind