Some solutions to deal with climate change could damage the environment. An idea under scrutiny is deep-sea mining - the exploration of metals used for 'green' products, which could undermine delicate ocean ecosystems. Sam and Neil discuss the topic and teach you related vocabulary.

This episode's question:
According to recent estimates by Unesco oceanographers, how many different marine species have their home in the ocean?
a) 70,000
b) 170,000
c) 700,000
Listen to the programme to find out the answer.

Vocabulary:
 1. paradox 
situation that seems impossible because it contains two opposite ideas 

2. conundrum 
problem that is very difficult to solve 

3. increase/grow by a factor of (x) 
be multiplied by that many (x) times 

4. silver bullet 
simple and immediate solution to a complicated problem 

5. slippery slope 
situation or habit that is difficult to stop and is likely to get worse and worse 

6. open the door to (something) 
(idiom) allow something new to start, or make it possible to happen

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