By 2017, China will establish the largest megacity in the world. Many complex surgeries will be performed by robots by 2018. Also by 2018, scientists will drill into Earth's mantle, a missile defense shield will be established in Europe, and manned fighter planes will be phased out and replaced with UAVs. Internet use will reach 5 billion worldwide by 2020 and the European Extremely Large Telescope will be operational by 2022. Some of Britain's most well-known animal species and African elephants in the wild will be extinct by 2025 and 2024 respectively.