Solve the following minimal spanning tree problem starting at node 1. 
Definitions:
Spaceship-Earth
A metaphorical concept suggesting that Earth is like a spacecraft with limited resources that must be shared and protected by its inhabitants.
Rachel Carson
An American marine biologist and environmentalist whose landmark book, "Silent Spring," raised awareness about the dangers of pesticides and sparked the modern environmental movement.
Silent Spring
A book by Rachel Carson that highlighted the adverse effects of pesticides on the environment, marking the beginning of the environmental movement.
Kyoto
A city in Japan that was the site of the Kyoto Protocol, a 1997 international treaty aimed at fighting global warming by reducing greenhouse gas emissions.
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