Plant-diversity is under threat from human activities, habitat loss, fragmentation, degradation, overgrazing, pollution and population growth, over-exploitation of natural resources, invasive alien species and environmental degradation. Other important threats to biodiversityas like overharvesting of selected species, pollution, toxic discharges, habitat alteration, competition, narrow geographical area, disease and parasites, habitat acidification, modification homogenization of ecosystems, natural disasters, deforestation, and soil erosion are the important threats to biodiversity. Plant diversity provides essential goods for human welfare like as food, fibre, that’s most important. Plant diversity and the many ecosystem services that it provides are a key factor determining human well-being. Plant diversity is losses has-direct and indirect negative effect on living organism. Over the next few decades, as monoculture yields continue to decelerate or decline for many crops, and as demand for ecosystem services continues to rise, diversification could become an essential tool for sustaining development and ecosystem services. Floral diversity provides us much essential welfare like food, fiber. Loss of variety of plants has direct and indirect result as negative impact on organisms. Over the next few decades, as monoculture yields continue to decelerate or decline for many crops, and as demand for ecosystem services continues to increasing, diversification can become an essential tool to sustaining growth and ecosystem services. The stress on floral-diversity is far beyond the levels imposed according to the natural global climate changes occurring in the recent evolutionary past. This includes increased temperature, shift of climatic zones, melting of snow and ice, rise in sea level, drought, floods and other extreme weather events increased invasions.

Keywords: Floral Diversity, Threats, Overgrazing, Food and Climate.