Home Current: Topics Topics Ag Matters’ topics pages provide background information, resources and links on subjects directly relevant to your efforts to reduce greenhouse gas emissions and achieve other environmental goals. Climate change basics Earth is heating up due to rapidly increasing concentrations of greenhouse gases in the atmosphere. Significant changes to the climate are occurring as a result. Soil carbon What is soil carbon, what influences it, and why is it hard for New Zealand farmers to verifiably increase their stocks without changing land use? Measuring soil carbon Obtaining long-term temporally- and spatially-comprehensive data is key to better understanding how New Zealand’s agricultural soil carbon stocks are changing within different land uses. Know your number Knowing what your greenhouse gas emissions are and where they come from is the first step towards reducing emissions. Government and climate change The Government is taking active steps to move New Zealand towards lower greenhouse gas emissions and greater resilience to a changing climate. On-farm forestry Trees that are actively growing remove carbon dioxide from the atmosphere and store it as carbon, so farm forestry can make an important contribution to mitigating climate change. However, it's a complex topic.