Q.List any two major causes other than anthropogenic causes of the loss of biodiversity.

Biodiversity loss can occur due to natural processes, distinct from human-induced factors. Two major non-anthropogenic causes include:

• Natural geological and climatic changes: Over vast geological timescales, natural shifts in Earth's climate, such as ice ages and interglacial periods, along with significant geological events like volcanic eruptions or continental drift, have historically led to mass extinctions and substantial biodiversity loss. …

Biodiversity, the rich tapestry of life on Earth, is constantly evolving, with species appearing and disappearing over geological timescales. While much of the current global concern rightly focuses on the accelerated loss of species due to human activities, it is crucial to understand that extinction is also a natural process, independent of human intervention. Life on Earth has a long history marked by periods of both flourishing diversity and significant decline, even long before humans emerged.

Here are two major causes of biodiversity loss that are not anthropogenic:

• Natural Mass Extinctions

  The Earth's history is punctuated by several periods where a vast number of species vanished relatively quickly across different taxa and geographical regions. These are known as mass extinctions. Unlike the gradual, continuous loss of species, mass extinctions are catastrophic events that drastically reshape the planet's biodiversity. The NCERT textbook explicitly mentions that "large-scale loss of species like the one we are currently witnessing have also happened earlier, even before humans appeared on the scene." A prime example is the mass extinction event approximately 65 million years ago, which led to the disappearance of the dinosaurs, along with many other forms of life. Such events are typically triggered by large-scale natural phenomena, such as massive asteroid impacts, extensive volcanic eruptions that alter global climate, or dramatic and prolonged natural shifts in Earth's climate (like severe ice ages or rapid warming cycles) that species cannot adapt to quickly enough.

  Note

  It is important to distinguish these natural mass extinctions from the current "sixth mass extinction" that scientists believe we are experiencing. The key difference is that the current one is primarily driven by human activities, whereas the previous five were due to natural causes.

• Natural Background Extinction Rate and Gradual Environmental Changes …

Separate the question's scope: it explicitly excludes anthropogenic (Evil Quartet) causes. Fall back to the chapter's own aside that large-scale species loss happened before humans …