Unit 2: Externalities arising from growing roses in Kenya

On Valentines day, The Guardian had this article on the impact of growing roses around Lake Naivasha in Kenya

http://environment.guardian.co.uk/conservation/story/0,,2012105,00.html

Identify:
a) The private costs and benefits to the producers and consumers of growing these flowers in Kenya
b) The external costs and benefits which arise from this activity