<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: the author used co2 emission data ("total co2 emissions without land use, land-use change and forestry") provided by united nations framework convention on climate change. data are available at http://unfccc.int/ghg_data/ghg_data_unfccc/time_series_annex_i/items/3814.php.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>