and Drakensberg montane grasslands. The country had a 2018 Forest Landscape Integrity Index mean score of 4.21/10, ranking it 142nd globally out of 172 countries. Climate Eswatini is divided into four climatic regions: the Highveld, Middleveld, Lowveld, and Lubombo plateau. Generally speaking, rain falls mostly during the summer months (December to March), often in the form of thunderstorms. Winter is the dry season. Annual rainfall is highest on the Highveld in the west, between . The further east, the less rain, with the Lowveld recording per annum. Variations in temperature are also related to the altitude of the different regions. The Highveld temperature is temperate and seldom uncomfortably hot, while the Lowveld may record temperatures around in summer. The average temperatures at Mbabane, according to the season: The government of Eswatini has expressed concern that climate change is exacerbating existing social challenges such as poverty, a high HIV prevalence, and food insecurity and will drastically restrict the country's ability to develop, as per Vision 2022. Economically, climate change has already adversely impacted Eswatini. For instance, the 2015–16 drought decreased sugar and soft drink concentrate production export (Eswatini's largest economic export). Many of Eswatini's major exports are raw, agricultural products and are therefore vulnerable to a changing climate. Biodiversity and conservation Eswatini has a spectrum of formal and informal conservation areas that protect the nation's rich biological diversity. These areas comprise about 5% of the country's land area. Eswatini has over 820 species of vertebrates and over 2400 species of plants, with many endemic species. This diversity suggests Eswatini is globally important for biodiversity conservation. Land degradation and conversion to other land uses are the major threats to biodiversity, including plantation agriculture (legal and illegal), bush-clearing, the spread of alien and invasive plants, and unsustainable resource harvesting; major land fragmentation is evident. Eswatini is a signatory to the Convention on Biological Diversity, the Convention on International Trade in Endangered Species (CITES), and the United National Framework Convention on Climate Change. There are three main government ministries responsible for national biodiversity management: the Eswatini National Trust Commission, the Eswatini Environment Authority, and the Ministry of Agriculture and Cooperatives. In addition, Big Game Parks, a private entity, is tasked with the management of the Game Act, which controls wildlife and CITES. There are 6 formal and more than 10 informal protected areas in the country. The formally gazetted areas include: Malolotja Nature Reserve,