¿Cuál es la dificultad de Minería de Bitcoin?

What is the difficulty level of Bitcoin mining, and how does it impact the process of extracting new coins from the blockchain? How does the network adjust the difficulty to ensure that blocks are mined at a steady rate, and what factors contribute to the changes in difficulty over time? Additionally, how does the complexity of Bitcoin mining affect the energy consumption and environmental impact of the network, and what measures are being taken to address these concerns?