Sentence completion del Listening B2 First: audio y respuestas

Good afternoon everyone. My name is Dr Sarah Chen, and today I'd like to talk to you about my work in marine wildlife conservation, specifically focusing on coral reef restoration.

I've been working in this field for about twelve years now, ever since I completed my PhD at the University of Plymouth. My initial research was actually on seabird populations, but I switched to coral reef ecology after a visit to the Great Barrier Reef in 2013 completely changed my perspective.

So, what exactly does coral reef restoration involve? Well, essentially, we grow fragments of healthy coral in underwater nurseries, and then transplant them onto damaged reefs. It sounds straightforward, but in reality, it requires enormous patience. A single coral fragment might take up to three years to grow large enough for transplanting.

One of the biggest challenges we face is rising ocean temperatures. When the water gets too warm, corals expel the algae living in their tissues, which causes them to turn white — a process known as bleaching. We've found that some coral species are more resistant to temperature changes than others, and we're now focusing our efforts on cultivating these hardier varieties.

Funding is another significant obstacle. Our primary source of income comes from government grants, but these have been reduced by nearly forty percent over the last decade. To compensate, we've started running what we call 'citizen science' programmes, where paying volunteers join us on diving expeditions. This serves a dual purpose: it generates income, and it also raises public awareness of the issues facing our oceans.

The technology we use has evolved dramatically. When I started, we relied mainly on manual underwater surveys, which were incredibly time-consuming. Now we use underwater drones equipped with high-resolution cameras to map large areas of reef in a fraction of the time. We've also recently begun experimenting with 3D printing to create artificial reef structures that mimic the natural ones.

In terms of results, I'm cautiously optimistic. At our main project site in Indonesia, we've seen a thirty-five percent increase in fish populations around the restored areas over the past five years. That's a really encouraging sign because it suggests the ecosystem is beginning to recover.

Looking ahead, I believe the key to long-term success lies in collaboration. No single organisation can solve this problem alone. We need governments, scientists, local communities, and the private sector all working together. I'm particularly excited about a new partnership we've established with a major shipping company, which has agreed to modify its routes to avoid our protected areas.

Finally, I'd like to say that while the situation is serious, it's not hopeless. Coral reefs have a remarkable ability to recover if we give them the chance. Our job is to buy them the time they need.