Germany's 16 national parks cover 0.6 percent of its landmass, providing a haven for thousands of species of flora and fauna.

Moritz National Park, in the country's northeast is the largest, stretching over 320 square kilometers. That area includes UNESCO World Natural Heritage beech woods, protected since the 18th century, bog forests and more than 100 large lakes.

However, the man responsible for protecting the area is keen to point out that no matter how big, parks are not the answer to the world's biodiversity crisis.

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"Like climate change, protecting biodiversity is such a major international challenge. No individual countries or national parks can resolve it. The world must work together," Ulrich Messner told CCTV.

He is looking to global leaders, meeting virtually in the Chinese city of Kunming to introduce concrete measures to reverse years of damage to nature, caused by humans.

"We are all to blame," he observes.

Moritz is home to a fascinating array of animals, from majestic eagles to humble beetles. They are able to flourish because of a policy of non-interference. The environment is not managed – trees are left to fall and rot, creating a haven for insects and fungus. The principle of the park is to allow visitors to come close to nature, without having any impact on it.